1. 【Top quality】 ： Made from high quality TCT carbide, high quality titanium plated carbide pilot drill bit, ensuring its high hardness, rust resistance, sturdiness and durability ； 2. 【Large size】 ： Includes 16mm / 22mm / 30mm / 40mm / 50mm / 60mm ， Each hole cutter is individually wrapped in plastic box and each bit is also oiled (prevent rusting). 3. 【Unique Three Blades Design】: These TCT hole saw teeth designed with three blades, include outer blade, center blade and inner blade, which makes it sharper and more efficient, ideal for cutting metals tough; 4. 【Multipurpose Tools】: This hole saw set is applicable to bench drill, magnetic drill, pistol drill, hammer drill, etc. Perfect for stainless steel plate, square tube, iron, cast iron, wood, F.R.P and other general sheet metal ； 5. 【High precision and ease of use】 ： TCT carbide steel teeth for fast cutting of clean round holes. Suitable for hand-held electric drill, stand-mounted motor drill, and ribbon-type movable magnet drill