Additionally, the shaft ensures optimal power transmission. No slipping of the drill! The 135º high-performance cutting edge provides very high centering accuracy, especially in hand-held applications with the cordless drill. The cutting edge prevents slipping when drilling into curved surfaces. Increased battery life is achieved by reducing cutting forces. The black chamfer enhances wear resistance and prevents cold welding and build-up of cutting edges. The 40º twist angle allows for perfect and rapid chip removal, ensuring high cutting speeds with increased stability and accuracy.