Lenox 30881VB1 Lenox Vari-Bit VB1 Step Drill Bits, 1/8-inch to 1/2-inch (30881VB1)

30881VB1 Vari-Bit 1/8″ to 1/2″ Step Drill Bit with 1/4″ Shank. 13 Steps. Hole sizes: 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, 1/2″. Metric hole sizes: 3.2, 4.0, 4.8, 5.6, 6.4, 7.1, 7.9, 8.7, 9.5, 10.3, 11.1, 11.9, 12.7 mm. Chuck diameter: 1/4″ (6.4 mm). Patented 2-Flute Design cuts fast, clean, burr-free, round holes. Split Point Design starts on contact for fast penetration and less walking. Steam Oxide Coating improves durability for longer tool life. Enhanced Flute Design for more rapid chip removal.