Our rubber-based bench block helper comes with two interchangeable blocks - a steel block for use with a chasing hammer (for flattening and hardening metal and wire) and a nylon block for use with a rawhide mallet (when hardening without flattening is desired). This is a well made set, and allows you to hammer without creating excess noise.
Rubber base: 4" diameter
Steel block: 3" diameter
Nylon block: 3" diameter
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