Gstk Upgrade Heavy Duty Carbide Hole Saw 14 Pcs,Metal Steel Hole Saw, Wrench ?14 in one?This set includes : 12 hole saws which are 14mm(9/16?), 16mm(5/8?), 19mm(3/4?), 22mm(7/8?), 25.5mm(1?), 29mm(1-1/8?), 32mm(1-1/4?), 35mm(1-3/8?), 38mm(1-1/2?),45mm(1-3/4?), 51mm(2?), 54mm(2-1/8?)with 2 Extra Titanium Plated Pilot Center Drills and 2 L-Wrenches . ?Compatible Quality?Our hole saw is made of high quality TCT Carbide( Tungsten Carbide Tipped Cutters), ensures its high hardness, rust proof and heavy duty. And the center drill adopts with high accuracy, it?s hard to break. ?Unique Selling Point?Tipped tooth blade,faster cutting experience. Double round circles to remove metal filings easily and efficient cooling. Eligible for rechargeable drill,portable hand drill,bench drill,electric drill and etc. ?Wide Application?Ideal for stainless steel, metal, iron, and plastic, aluminum, FRP, etc. so on. (test for your reference: it apposite to cut a hole on 3mm stainless steel,15mm iron plate,15mm aluminum alloy.) ?Reminder?For safety purposes, remember to add coolant during continuous high-speed drilling, and please wear protective goggles and gloves when using our hole saw set.