Expert quality japanese high carbon steel hardened tempered straightened and stress relieved to ensure blade straightness fine ground blade surface coated in ultra tough lacquer to prevent corrosion and ease friction during sawing main blade 10tpi11ppi hardpoint opposed tooth design to allow fast cutting and sawdust removal in both forward and reverse action on main blade blade end curved with reverse tooth to allow user easy start into floorboards and underfloor cavities shock absorbing ergonom