This thonging chisel set is crafted from tempered steel. Professional model set includes thonging chisel tubes to punch 1/16" (1.5 mm), 3/32" (2.3 mm) and 1/8" (3.1 mm) slits, one and three prong chisel for each size slit and an easy change handle. Six tools in one. Use Protecto Board #3461 or Poly Cutting Board #3464 as a base to punch into. This will help protect your tools and your table top.