HSS M42 HEAT TREATED BI-METAL CUTTER: : Made of high quality HSS carbon steel and bi-metal steel with sharp edges and high hardness. strong and sturdy. The precision of the concentric degree, so that the teeth edge of the uniform, extends the life of the hole. CUTTING DESIGN: : With its clean and non-binding edge design, this hole saw cuts easily and smoothly. And the spring on the drill tip would automatically push the disc out of the saw immediately after completing the hole. APPLICATION: : Suitable for pistol drill, drill press, vertical drill, etc. Widely used in holes for slabs, household wood, galvanized pipe, fire hose, plastic, drywall and other opening operations. Number of products: 2 pieces Color: black + red Size: Hole diameter: 60-200 mm Working depth: 25 mm Shank diameter: 10 mm Center drill: 6*57mmLonvre