【wood drill size】 - Total length: 16 cm, Drill length: 11 cm, Drill diameter: 42 mm. For hammer drill with 1/2 round shank and 1/2 hex shank. High performance material: Premium carbon steel woodworking drill bit. Exceptionally strong, impact and wear resistant. long service life, high hardness, super toughness. 【Efficient work】 - Efficient wood cutter for felling and opening wood to quickly separate wood and increase productivity. Not recommended for knotty woods or large diameter hardwoods. 【Largely used】 Split hard oak, hickory, walnut, plane tree, widely used for home, outdoor, camping, farms. Whether for family, camping or farm, can be easily used. Easy to use: just insert the drill into the drill and drill into the wood. The firewood is then slightly dirty. No moving blades, and you don't have to worry about your kids swinging an axe.