DOUBLE TOOTH DESIGN STRENGTHENS EACH TOOTH FOR LONGER LIFE AND IMPROVED DURABILITY;SHARPER TOOTH GEOMETRY CUTS MATERIAL FASTER FOR FASTER DRILLING;THICK HARDENED BACKING PLATES PREVENT THREAD STRIPPING;DEEP CUT STYLE HOLES SAWS WILL CUT 2X MATERIAL IN 1 PASS;INCREASED HIGH SPEED STEEL HEIGHT (HIGHEST IN THE INDUSTRY) IMPROVES HOLE SAW DURABILITY;METAL MATERIAL APPLICATION;95 MAX RPM