Side mount hold-down Cover (goes over the locking bolt). Length: approx. 2 & 9/16 inches. Diam.: approx. 1 & 29/64 inches. Top to start on indentation: approx. 2 inches. Height of indentation (at base): approx. 13/32 inches. Depth of indentation (at base): approx. 7/64 inches. Width of hatching near top: 17/32 inches. Inside opening diam.: approx. 1 & 1/16 inches.