Grub Screw M12x16x10.9 MF Spec

A grub screw, also known as a set screw, is a headless, fully threaded fastener designed to secure an object (like a gear, pulley, or handle) inside or against another object, typically a shaft. Because they lack a head, they sit flush or below the surface to prevent snagging and allow for a clean, secure, and compact fit.