Overview: These wood hole saw drills are suitable for drilling in soft woods such as MDF, pressboard, plastic, and hardwood. Features: Brand new and high quality Sharpness, high hardness, and precise positioning Easy cutting, impact resistance, and high toughness Made of high-quality alloy blade, sharper, more durable Curved head design, chip removal, punching is more efficient Can be used for punching wood, installing spherical door knobs, drawer knobs, plastic products, wood, plywood, etc. Suitable for electric drill, motor drill, hammer drill, and mobile belt drill Specifications: Material: hard alloy Color: blue & Silver Blue Head diameter: 15mm/0.59 \", 42mm/1.65 \", 50mm/1.97 \", 53mm/2.09 \" 34;, 55mm/2.17 \", 60mm/2.36 \", 65mm/2.56 \", 70mm/2.76 \", 75mm/2.95 \", 80mm / 3.15 \" Shaft diameter: Approx 7mm / 0.27''(15mm) Approx 42mm to 10mm Tail length: Approx 15-80mm (67-68mm / 2.63''-2.67'') Total length Length: approx 78-80mm / 3.07''-3.14'' (15-60mm) approx 83-86mm / 3.26'-3.38' (65-80mm) Package content: 1 x wood drill