Plugs are very slightly tapered.
Recommended for use with a pillar drill.
Shank Diameter=1/4 inch hex
Plug size=1/2 inch
Plug size=12.7 mm
Taper range approx.=12.6 to 12.8 mm
Shank Diameter: 1/4 hex
Diameter Imperial: 1/2
Diameter Metric: 12.7
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