Size: 38 mm(drill) High Quality Material - Made of high quality high carbon steel, it's exceptionally strong, impact resistant and wear resistant. No easy to breaks due to vibration 3 Modes Drill Bits - Square Handle, Round Handle, Hex Shank. Different models and sizes to meet your all needs and can be used for different types of electric drills Efficient Work to Save Time - Efficient tools for logging and open the wood for quick separation of logs and increased productivity. Titanium coating to reduce friction and heat by heat treatment,makes cutting easier and more durable Unique Design and Easy to Use - Geometry reduces friction and saves time. Just install the drill bit into the power drill( Fit most magnetic drills) ADVANTAGE - Split tough oak, hickory, walnut, sycamore; Not recommended for knotty woods or large diameter hardwoods