【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 do the cutting smoothly. 【5 HOLE SAW SET】 16mm/0.6 inch, 18.5mm/0.7 inch, 20mm/0.8 inch, 25mm/1 inch, 30mm/1.2 inch; Length: 65mm / 2.55inch, Diameter: 8mm8; 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 a spring-loaded design which is perfect for chip removal, drilling efficiency is superior.The important thing is that the handle adopts the hexagonal design, which makes the drill more stable, could totally avoid