Shank diameter: 1/4 inUsed with: 1L, 2L, 4L arborAdded durability: hardened carbon steel for strength through the cross-sectionEachShank diameter: 1/4 inUsed with: 1L, 2L, 4L arborAdded durability: hardened carbon steel for strength through the cross-sectionAdvantage™ Pilot Drill Bit, 1/4 in, Used with 1L, 2L, 4L Arborhttp://s7d5.scene7.com/is/image/Staples/s0481281_sc7?$std$http://s7d5.scene7.com/is/image/Staples/s0481281_sc7?$thb$http://s7d5.scene7.com/is/image/Staples/s0481281/Advantage-Pilot-Drill-Bit-1-4-in-Used-with-1L-2L-4L/product_793514Advantage™ Pilot Drill Bit, 1/4 in, Used with 1L, 2L, 4L Arbor0.00