(50) 5/16-18 X 1 3/4 Flat Head Thread Cutting Screw Type F Steel Self Tap 1.75"
Tapping Screw Type F. 5/16-18 X 1-3/4" Flat Head Thread Cutting Screw (countersunk) Type F Steel Self Tap 1.75". Because these screws possess almost twice the strength of ordinary machine screws much smaller screws can be used.