Steel Bench Block - with Nylon Block and Rubber Base - SFC Tools - 12-500 Comes with a steel bench block, a nylon bench block, and a rubber base that can house either of them. Steel and nylon blocks measure 3 (7.6 cm) in diameter and 0.75 (1.9 cm) thick. Rubber base measures 4 (10 cm) in diameter and 1.25 (3.2 cm) thick and snuggly houses either block. Overall weighs 2 lb 2 oz (963 g).