Attributes . (1) Hex Head Cap Screw, 1/4-20, 1/4-20 x 1(1) Flat Washer, 3/8-16 x 1(1) Hex Head Cap Screw, 3/8-16(1) Spin-lock Nut, 3/8(1) Flat Washer, 5/16(1) Spin-lock Nut . Names