1.0mm = #61

1.0mm = #61

Before I place a pricey order with McMaster Carr (my habit seems to be to go from zero to hero), does anyone have a different recommendation for the small drill bits #61-80 that are actually sharp and

Step #1: After blackening the roof vent, take a pin vise and using a #61 drill bit, carefully drill a small hole in the base of the vent. If the surface is at an angle, start perpendicular to the su