Size cutting diameter：1/2" (13mm), cutting depth: 1 inch（60mm）, shank dia.: 3/10 inch(8mm), perfect for drilling hard metal Material made from high quality tct carbide( tungsten carbide tipped cutters), high-grade titanium-plated cemented carbide tooth, ensuring its high hardness, rust proof, sturdy and durable Unique three-blade design this tct hole saw teeth designed with three-blade, include outer blade, middle blade, and inner blade, making it sharper and more efficient, ideal for cutting hard metals Multipurpose tools:This hole saw set apply to bench drill, magnetic drill, gun drill, drill percussion and so on. Perfect for hard metal, stainless steel plate, square tube, iron, cast iron, wood, f.r.p and other general sheet metal；note: Cannot be used for concrete, tiles and stone Reminder: For safety purposes, remember to add coolant during continuous high-speed drilling, and please wear protective goggles and gloves when using our hole saw set A+