These Mandrex ULTIMATE 4X PowerXbit Spiral flute Wood Bits with 4 cutting edges are specifically designed for faster and very accurate drilling in wood. Our unique self-feeding threaded QuickTip Technology enables the drill bit to effortless pull itself into soft and hard wood. Fast Chip removal in hard and soft wood, 5 times quicker compared to standard auger bits and more precise drilling due to our low friction grinded flute geometry and 4 cutting edges. This fast and accurate drill bit has a 1/4-inch hex shank and can be used in in cordless and corded impact and drill drivers and drill benches. FEATURES - For hard and soft wood - More then 5 times faster - Extreme fast because of the self-feeding QuickTiptm technology - Cutting depth 160mm and Hex 1/4-inch shank - Highest grade hardened steel, extremely wear-resistant cutting edges - Precision grinded 4 cutting edges - Clean and straight drilling