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5 Pce 10-31mm 90 Degree HSS Co5 Triple Flute Countersink Set
68mm Brilliant Diamond Hole Saw
The right hand spiral forces the swarf out of the hole and prevents the chips from clogging at the bottom of the hole or in the flutes
The intersection of the hole and cone form the cutting edge on the tool
5mm (3/16") thick heavy-duty backing plate eliminates need for drive plate
Metric/Fractional HSS 1/2” Reduced Shank Drill Sets Size:16mm - 25mm 4pce Metric 1/2” Reduced Shank Drill Set 5 Pce 10-31mm 90 DegreeReduced shank HSS twist drill set. 118 notched point with 30 helix. Notched point is a variation on the standard chisel point, providing faster starting and reduced drill wander. 118 point angles are ideal for use in materials such as mild steel and cast iron. The 118 point creates easily controlled chips which are wide and thin. Bordo reduced shank HSS drills are ground and then a black finish is achieved by steam tempering, a thermal process
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