*Essential jewelers tool - used to form, shape and stamp soft metals *1"-thick solid rubber provides firm, non-scratch, non-marking surface *High-density & heavyweight (15 oz) to prevent deforming *Dozens of other uses for arts & crafts, woodworking, metalworking - even auto body repair *4" square, black; also in 2-1/2" square, 4" solid steel and 4" combo steel-rubber