Jig set designed for accurate drilling of nuts and bolts for use with safety lock wire 
Both jigs can be mounted in a vice for drilling 
To suit Imperial threads 
Adaptive size: for bolt shaft (W32 × D13 × H40 mm, 85 g)
M 6 × 1.0, M 8 × 1.0, M 8 × 1.25, M 10 × 1.25, M 10 × 1.5, M 12 × 1.5
Adaptive size: For nut head (W102 × D10 × H19 mm, 112 g)
12 - 19 mm
Drill introduction hole diameter: 3 mm