【SUPER MATERIAL】 HSS high speed steel hole saw, which has high hardness and wear resistance. After high-density grinding and high-end heat treatment, it has high strength and precision to perform the cut smoothly. 【SET OF 5 HOLE SAW】16mm/0.6in, 18.5mm/0.7in, 20mm/0.8in, 25mm/1in, 30mm/1.2in; Length: 65mm/2.55in, Diameter: 9mm/0.35in; 5 pieces Hole cutters are individually packed in a plastic box, all come with their own allen key to remove the pilot bit and the bit also unscrews from the shank. 【HIGH EFFICIENCY】: Cuts quickly, with sharp blades and high hardness, in just a few minutes, the HSS hole saw kit cuts holes precisely in laminates of steel, stainless steel, iron, copper, brass, aluminum, fiberglass, formica, etc. 【INTELLIGENT DESIGN】The hole cutters use spring-loaded design which is perfect for chip removal, the drilling efficiency is higher. The important thing is that the handle adopts the hexagonal design, which makes the drill more stable , could totally avoid the