6 size configurations (20 pieces each): Weaver-Oval (T-10 Torx): #6-48 x 1/4', #6-40 x 1/4', #6-48 x 3/8' Weaver-Oval (T-15 Torx): #8-40 x 1/4', #8-40 x 3/8', #8-40 x 1/2' Hardened steel with a black oxide finish