Nut Drill Jig allows the safety wire holes to be drilled through the head of bolts or through nuts, across the diagonal easily.
It will accept up to a 3.5mm diameter.
Imperial Bolt Drill Jig provides 6 drill holes for imperial sizes: 1/4＂- 20, 5/16＂- 24, 3/8＂- 24, 7/16＂- 14, 5/16＂- 18 and 3/8＂- 16 bolts.