Plug cutter set for no.8 screw size. specification:. Screw size=no.8. Quick chuck. Drill countersink. Pozi bit. Plug cutter=3/8 inch (9.5mm). Shank diameter=1/4 inch hex. spare parts::. Trend snappy 3/8 dia plug cutter tr_snap/pc/38. Trend snappy quick chuck only tr_snap/qc. Trend snappy countersink with 7/64 drill tr_snap/cs/8. accessories::. Trend snappy metal rack red tr_snap/rack/1.