Wood Drill Bit SizeTotal length: 16cm, drill length: 11cm, drill diameter: 42mm. For 1/2 round shank and 1/2 hex shank hole punch. High Quality MaterialThe firewood drill is made of high carbon steel material, durable shock-proof, wear-resistant, high hardness, toughness and durability for long service life. AdvantageGrooved non-slip design for long working hours , making work comfortable. Efficient WorkEfficient wood cutter for cutting and opening wood, to quickly separate wood and increase productivity. Not recommended for Nordic woods or large diameter hardwoods. How to useJust install the bit into the electric drill and drill the wood, and the firewood will be pulverized easily with its optimum hardness and strength. No moving blades, and don't worry about your kids swinging an axe.