Socket screw, hex, allen head, stainless steel, GR A2-304, STD, 16 x 2 x 90 mm, Fastbolt.

A socket cap screw, also known as a socket head capscrew, socket screw, or allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole. Stainless steel is a family of iron-based alloys that contain a minimum of approximately 11% chromium, a composition that prevents the iron from rusting, as well as providing heat-resistant properties.