12 gauge. The hone I used is from Amazon
:
Lisle 10000 Brake Cylinder Hone
4.6 out of 5 stars 29 customer reviews
List Price: $17.09
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Square ends of stones hone to the end in step-cut and blind-end cylinders
240 Grit stones are 1 1/8" long
Flexible driver
Skin-packed
