9.6 Inch Bi-Metal Hole Saw Hss Hole Cutter Heavy Duty For Drilling Wood Plastic STR BiMetal Hole Cutteris made of advanced welding technology in the current welding technology. Sharp teeth, low vibration Onetime complete and durable, shatterproof and short hole opening time Reminder: When opening the hole, you should add coolant to prevent shortening the life. ?Size?:9.6 inch hole saw (245mm) comes with arbor;Hole saw made of top HSS Bi-Metal for Heavy Dusty capability improved durability with Rust-proof ?Material?:Made of bimetallic material,microcrystalline coating,heat insulation+wear resistance+rust prevention ?Advantages?:Center positioning,precise drilling,arc spiral chip flute,omni-directionalchip hole design,high efficiency,fast hole drilling,and low vibration ?Features?: High hardness, wear resistance, accurate positioning, good chip removal, high efficiency ?Scope of application?:Thin iron sheet,aluminum alloy,solid wood board,gypsum board,plastic