High carbon hlau. Hauv av thiab taw tes cov hniav kom zoo, tsis muaj kev sib cais ntawm ob sab ntawm lub workpiece. Kuj ua haujlwm yam tsis muaj kev cuam tshuam. Ntoo txiav: nkhaus txiav hauv plywood, yas, laminated particleboard, tawv thiab mos ntoo 5/64 "- 3/4".