Description GRUB SCREW DIN 916, A small headless grub screw, used typically to attach a handle or cam to a spindle. Grub Screws with an Internal Hex Allen Drive. Set Screws are blind (headless) fasteners with an internal hex drive. It is this drive style that classifies stainless steel screws in this selection as set screws, which are driven by a hex bit or Allen wrench.
