6mm-1.0 x 12mm A2 Stainless Steel Coarse Thread Cup Point Hex Socket Headless Set Screws 6PK, Midwest Fastener, Mfr#: 79675

A set screw is a type of screw generally used to secure an object within or against another object, normally not using a nut. The most common examples are securing a pulley or gear to a shaft.