Mark Yato Symbol YT-3381 Series GRD Application cutting holes in stainless steel, cast iron, aluminum, wood, plastics Set contents bi-metal hole saw x11 (19 mm, 22 mm, 25 mm, 32 mm, 35 mm, 38 mm, 44 mm, 51 mm, 57 mm, 64 mm, 76 mm), hole saw holder x2, spring, extension Thread size 1/2" (12.5 mm), 5/8" (16.0 mm) Number of teeth per inch 4-6 TPI Cutting depth 40mm Diameter of foraminifera 19, 22, 25, 32, 35, 38, 44, 51, 57, 64, 76 mm Material of foraminifera HSS M3, bimetal Number of pieces in the set 15 A set of professional bi-metal hole saws for drilling holes in metal, sheet metal, sections and pipes. Also perfect for drilling in plastics, furniture boards, structural sandwich panels and resins. recommended for professional use in industry, services and workshops The hole saws are made of the highest quality materials - teeth made of HSS M3 high-speed steel. progressive tooth profile enhances aggressive cutting The set includes a variable tooth pitch of 4-6 TPI (TPI - the number of teeth per 1 inch, i.e. 25.4 mm), which greatly increases work efficiency.