Drill/Countersink/Counterbore, Set of 7, 3.2/3.6/4.0/4.4/4.8/5.2/5.6 mm. Tapered drill, #717327
Tapered Drill Adjustable Drill Countersink Counterbore, 7-Piece Set
A tapered HSS drill is the gold standard for seating tapered screws such as traditional brass or silicon bronze screws in boatbuilding. These screws, which have some plain shank under
