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】:5.5 inch hole saw (140mm) 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