M12 x 1MM x 12MM FINE PITCH HIGH TENSILE GRUB SCREWS CUP POINT ALLEN SOCKET SETS

Socket Cup Point Grub Screws, also known as Set Screws, feature an internal socket drive, and are fastened with a Hexagonal/Allen key. Grub Screws are used to connect two objects together by threading into one and applying tension to the other.

eBay