Lenox VB7 Specifications Chuck Size (Inches): 3/8" Unibit: 11 Klein Unibit: 8-59008 Hole Sizes (Inches):7/8 (for 1/2" conduit)Lenox VB7 featuresAccurate, burr-free holes: Patented two flute design cuts fast, clean, round holes. Starts on contact: Split point design for faster penetration and less walking.Long tool life: Steam oxide coating adds durability. Enhanced flute design removes chipsrapidly, ensuring longer tool life