LEGO NEW 1x2-2x2 Dark Stone Grey Bracket Top (10x) 6117972 6048854 Brick 44728 | eBay
Had an idea of using building blocks to get kids introduced into wargaming so designed some weapons and ball joints to make mechs. Releasing the STLs for free for you guys :
LEGO Bracket 1 x 2 - 2 x 2 (21712 / 44728) | Brick Owl - LEGO Marketplace