The MTE Industries Allen II Saf-T-Blok is designed for all socket head cap screws Metric and SAE. As an added plus, it can be used as a tubing drill guide. As with all the Saf-T-bloks, this takes the headache and hassle out of drilling safety wire holes.
Note: Used for Allen Head Bolts.
Per the package instructions, the drill bit sizes that work with this tool are 1/16" (#53) or 5/64" (#48).
The hole is 1.125".