3 types of bits: square handle + round handle + hexagonal shank. 42mm. Different models to meet all your needs and reusable for different types of electric drills. Newly updated and stronger: Made of high quality high carbon steel, it is exceptionally impact resistant and wear. Does not break easily even with vibration. Efficient, time-saving work: Efficient felling and drilling tools for rapid log splitting and increased productivity. Titanium coating to reduce friction and heat through heat treatment, making cutting easier and more durable. Easy to use: Simply install the bit into the electric drill and easily drill through the beverage. No moving blades, no risk with children. Advantage: Hard oak, white walnut, walnut, sycamore. Not recommended for knotty woods or large diameter hardwoods. Package Contents: 1 Wood Drill Bit. 3 Drill Handles .