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Kinzo 22mm Bi-Metal/HSS Multi-Purpose Hole Saw 8E0022 Hole saw made of top HSS & bi-metal for heavy dusty capability improved durability with rust-proof Sharper positive rake tooth cuts material fast This 4 Hole Saw Blade is designed for drilling metal sheet, drywall, plastic pipe, wood, PVC, fiberboard, grommet hole, recessed light, and can light hole drilling The increased wall thickness of the hole saw improves durability and minimizes tooth loss, 2X more durable with a 50% longer life Size: (D22 x H46)mm