Brad Point Drill Bit Set BKS D 1/8''-1/2'' CE/W/7CENTROTEC shank: greater bit stability with less runout providing fast changes while reducing weight Compact: The Centrotec shank reduces overall drill length by nearly 1 1 2" providing more clearance for tight spaces and improving user control Rapid chip ejection helps to ensure the bit has less friction and heat build up which can result in premature dulling. Corrosion resistant finish helps the bit to stay free of rust and provides a durable finish