Made of hardwood to prevent marring. Each depression is 1/2" deep with a smooth finish. The diameters include: .75", .875", 1", 1.25", 1.5", 1.75", 2.25". The 3" x 3" steel bench block is affixed and flush with the surface of the wood block.
*The bench block built into this tool is an economy bench block. It will have slight scratches (especially around the edges) and possibly some discoloration. Some have tiny black dots. Use steel wool to slightly buff the block and to remove the texture of the black dots. That will remove them but the discoloration might remain. For example, in the alt image on this product, those black dots are not raised or indented. They are smooth just discolored. Otherwise, the block is fine.