For Drilling pilot holes without undoing the chuck
Silverline Titanium Hex Drill Bit Kit. 1/8"-1/4" (3-6.5mm). Titanium-coated, 1/4" hex shank pilot drill bits for drilling pilot holes without undoing the chuck. Fits 1/4" hex shank. Not suitable for high torque applications. Sizes: 1/8", 9/64", 5/32", 11/64", 3/16", 7/32" and 1/4" (3, 4, 4.5, 5.0, 5.5, 6 and 6.5mm).