BENCH BLOCK WITH 4" RUBBER BASE 3" STEEL BLOCK & NYLON BLOCK METAL WORKING ANVIL (LZ 2.3 FRE) NOVELTOOLS BENCH BLOCK HELPER STEEL AND NYLON BLOCKS - 3" DIAMETER- WITH RUBBER BASE HOLDER - 4" BASE DIAMETER Round Bench Block 3" diameter, a combination Steel and Nylon Block with base. Block consists of a rubber base basically the holder for the interchangeable Steel and Nylon circular blocks, both fit into the base.