Amazon.com: Classic Building Bricks 1x1, 100 Piece, Compatible with Lego Parts and Pieces 3005, Creative Play Set - 100% Compatible with Lego and All Major Brick Brands(Colour:Light Gray) : Toys & Games
Lego Spare Parts Brick Modified 1x1 with Stud on 1 Side (Tan)
first time seeing this piece... 1x1, but 2 plates high. Why not just 2 1x1 plates? : r/lego