The LAIWEITCT Hole Saw Kit (Carbide Hole Saw) is an excellent alternative to conventional bi-metal hole saws, offering a faster, cleaner and longer lifespan. Hole saw kit includes 10 pieces 16mm hole saw, 18mm hole saw, 20mm hole saw, 25mm hole saw, 30mm hole saw, 35mm hole saw, 45mm hole saw, 50mm hole saw, 55mm hole saw , 60mm hole saw and two free drill bits. Cutting depth: metal thickness less than 20mm Shank diameter: 10mm in diameter High quality super hard blade and excellent steel body for long life and durability. Sophisticated processing technology, high cutting precision, hole saw made of super-hard stainless steel, fast cutting speed, smooth and burr-free. The durability of LAIWEI TCT hole cutter is 10 times that of ordinary carbide hole cutter. LAIWEI tools, best brands and best test results, product quality. Wide range of applications: TCT hole saws are widely used for drilling in stainless steel, high alloy steel, aluminum, plastic, FRP and PVC. Stainless Steel Hole Saw Bits can be used for food sheet metal, door metal, junction box drilling benches and home decor work. Please note: For different materials such as stainless steel and plain sheet metal, the appropriate speed and feed rate is different, please refer to the table. Stainless steel: 14-21mm hole saw (300-500rpm); 22-30mm hole saw (200-450rpm); 31-40 hole saw (175-315rpm); 41-50 hole saw (125-225rpm); 51-60 hole saw (95-150rpm; 60-75 hole saw (80-150rpm); 80mm above (60-120rpm). Ordinary sheet metal: 14-21mm hole saws (700-1000rpm); 22-30mm hole saws (500-800rpm); 31-40 hole saws (300-600rpm); 41-50 hole saws (200-500rpm); 51-60 hole saws (200-400rpm); 60-75 hole saws (150-300rpm) ; 80mm and above (100-200 rpm).What else can Levi do for you?  7x24 customer service.