90mm Bi-Metal Hole Saw (M42 HSS), Heavy Duty for Wood Aluminum Iron Plastic[HEAT-TREATED HSS M42 BIMETAL CUTTER]: Made of high quality HSS carbon steel and bimetallic steel with sharp edges and high hardness.strong and robust.The precision of the concentric degree, so that the edge of the teeth of the uniform, extends the life of the hole.[CUTTING DESIGN]: With its clean, non-binding edge design, this hole saw cuts easily and smoothly.And the spring on the tip of the drill would automatically push the disc out of the saw immediately after finishing the hole.[APPLICATION]: Suitable for pistol drill, drill press, vertical drill, etc.Widely used in holes for slabs, domestic wood, galvanized pipes, fire hoses, 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*57mm Lonvrèe