【GREAT MATERIAL】 HSS high speed steel hole saw made of high speed steel, which has high hardness and wear resistance. After high-density grinding and high-quality heat treatment, it has high strength and precision to make a smooth cutting. 【SET OF 5 HOLE SAWS】 16mm/0.6", 18.5mm/0.7", 20mm/0.8", 25mm/1", 30mm/1.2"; Length: 65mm/2.55", Diameter: 8mm8; 5pcs hole cutters are individually packed in a plastic box, all come with their own Allen key to remove the pilot drill and the drill can also be unscrewed from the shaft. 【HIGH EFFICIENCY】The HSS hole saw set cuts quickly, with sharp blades and high hardness in just a few minutes and cuts precise holes in laminates made of steel, stainless steel, iron, copper, brass, aluminum, fiberglass, formica, etc. 【SMART DESIGN】The hole cutters feature a spring-loaded design, which is perfect for chip removal and increases drilling efficiency. Importantly, the handle adopts the hexagonal design, which makes the drill more stable and can completely