Setobrick

LEGO part 3665: Brick Sloped Inverted 45° 2 x 1

Bricks Sloped49 colours2,372 sets

LEGO part LEGO part 3665: Brick Sloped Inverted 45° 2 x 1

Specifications

Reference3665
CategoryBricks Sloped
MaterialABS plastic
Colours49
Sets2,372
Listed pieces13,087
First appearance1995
Latest appearance2026
Element (White)6552106 · 366501
Most common colourWhite
Main themesStar Wars, Creator, City
SetopediaData: Rebrickable
Spec sheet updated on 2026-09-29

LEGO part 3665, Brick Sloped Inverted 45° 2 x 1, belongs to the Bricks Sloped category. It exists in 49 colours and appears in 2,372 sets of our database, from 1995 to 2026, for a total of 13,087 listed pieces. Its most common colour is White.

Number 3665 identifies the shape and is moulded under the part. Each colour also has its own element ID, the one Pick a Brick uses: in white, it is 6552106.

Part 3665 through the years

The oldest set in our database that contains part 3665 is 6090 Royal Knight's Castle, released in 1995 in the Castle theme. It is still in use: the most recent set featuring it, 11377 The Lord of the Rings: Minas Tirith, dates from 2026.

Its peak year is 2026, with 137 sets containing it. The set with the most copies is 10228 Haunted House: 94 copies, against an average of 5.5 per set.

It is spread across several themes, led by Star Wars (11%), Creator (8%) and City (8%). With 2,372 sets, it ranks no. 49 of 2,731 parts in our database and no. 5 of 105 in the Bricks Sloped category.

Sets containing part 3665, by period

PeriodSets
1995-1999150
2000-2009450
2010-2019911
2020-2026861

Colours of part 3665

5 colours appear in only one set: maersk blue (10152 Maersk Sealand Container Ship 2004 Edition), pastel blue (10155 Maersk Line Container Ship 2010 Edition), light nougat (76421 Dobby the House-Elf), bright green (60353 Wild Animal Rescue Missions) and olive green (75432 V-19 Torrent Starfighter).

Colour (element ID)SetsPiecesExample sets
White6552106 · 3665014471,598603377176576949
Black3665264221,615603371069660336
Light Bluish Gray42114373801,732103007533776435
Dark Bluish Gray42110963681,528103071069610305
Red366521276953769497595575331
Reddish Brown4211222238967764351031631120
Yellow366524197703714111071710317
Tan4159196 · 366505169720103007104376435
Blue366523133434106967532310717
Dark Tan612195977316417031031671767
Orange4616279 · 451595475254107177597841702
Light Gray3665027523710123609010030
Green4142989 · 411965972254764196034571763
Dark Red6005399 · 459081150179753017519210294
Dark Blue6554200 · 609749848184603481030271771
Lime6030276 · 416402835110769491071721331
Bright Light Orange6136455 · 603291933105717413109771408
Dark Gray4114060 · 36652731102470971914729
Medium Blue4598015 · 417983125109417037595375968
Dark Brown465491524132717417593670738
Medium Azure6070769 · 60527952389106982105841430
Dark Azure6298469 · 61356082380603354324971741
Sand Green4623297 · 41532802085103161031775318
Light Aqua63060301790213333112741430
Dark Pink4622743 · 46215441575107174143060314
Bright Pink6424111 · 6061686144910260411605010173
Medium Lavender6440109 · 46195091352710164103641365
Dark Purple6250643 · 46560811338763916033860408
Bright Light Yellow6070301930103122133341718
Coral6467785925426854552245521
Vibrant Yellow6609858 · 6380129623603216031943023
Purple4163840621451840147837
Lavender6223449618107174319741690
Sand Blue6212052 · 4153279615706743108431081
Dark Green4612727 · 4265357330762548947978
Dark Orange6482689 · 4267987317426311014442624
Dark Turquoise6328953 · 415835931276255603714722
Magenta6195504311413164145641637
Brown4143261 · 3665253107186101241380
Reddish Orange658405438313943137960512
Medium Nougat456953421875734840
Bright Light Blue6568022 · 6288284267794210361
Yellowish Green6566889264268143008
Royal Blue42260332387788799
Maersk Blue11610152
Pastel Blue4585672 · 425060711610155
Light Nougat64409611676421
Bright Green63997391460353
Olive Green65663781275432

Where to buy part 3665

Setopedia shows no prices: they vary by colour, condition and seller. Amazon links are affiliate links.

Search part 3665 on AmazonPick a Brick (lego.com)BrickLink entryRebrickable entry

Sets that include part 3665

Sets ranked by popularity that include at least one part 3665, in any colour.

Often found with part 3665

Parts that share the most sets with part 3665, based on set inventories.

More parts in the Bricks Sloped category

All parts in the Bricks Sloped category

Frequently asked questions

How many LEGO sets include part 3665?

Part 3665 (Brick Sloped Inverted 45° 2 x 1) appears in 2,372 sets listed on Setopedia, from 1995 to 2026, in any colour.

Which LEGO set contains the most copies of part 3665?

Set 10228 Haunted House, released in 2012, contains 94 copies, the highest count in our database. On average, a set containing part 3665 has 5.5.

Which colours does LEGO part 3665 come in?

49 colours are listed for part 3665. The most common is White, found in 447 sets.

What is the rarest colour of part 3665?

According to our inventories, it is olive green, found in only 1 set (75432 V-19 Torrent Starfighter).

What is the element ID of part 3665 in white?

In white, part 3665 has element ID 6552106 or 366501. Number 3665 is the mould number, the same for every colour.

Is LEGO part 3665 still used in recent sets?

Yes: it appears in sets released in 2026, such as 11377 The Lord of the Rings: Minas Tirith.

Where can I buy LEGO part 3665 individually?

Single parts 3665 can be ordered on Pick a Brick (lego.com) in colours currently produced, or on BrickLink for older colours. The part is also included in the sets listed on this page.