CRL's 2" (51 mm) Standoff Caps are supplied with a 3/8"-16 x 1" (25.4 mm) stainless steel Allen screw, one washer with molded sleeve, and one plain washer. They come in brushed or polished 316 stainless finishes to match our 2" (51 mm) diameter standoff bases. A hole in the side of the cap is provided for tightening the cap to the standoff base.