Slope Brick 45° 2 x 3 x 1 & 1/3 Double with Arm and Black Hook
Part Number 3135c01
Name Slope Brick 45° 2 x 3 x 1 & 1/3 Double with Arm and Black Hook
Category Supports, Girders and Cranes
Material Plastic
2 related parts (same mold or print family)

Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.