Attributes . Drill bits: 1/16 in (1.59 mm), 5/64 in (1.98 mm), 3/32 in (2.38 mm), 7/64 in (2.78 mm), 1/8 in (3.18 mm), 9/64 in (3.57 mm), 5/32 in (3.97 mm), 11/64 in (4.37 mm), 3/16 in (4.76 mm), 13/64 in (5.16 mm), 7/32 in (5.56 mm), 15/64 in (5.95 mm), 1/4 in (6.35 mm) . Names