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similar to a 12-point box end wrench
These drills have a 135 degree split point tip and a 3 -flat shank to prevent spinning
Part Number T/AT20X2
Size 1/2"-#4
Part Number D/ACO3/8X37/64
1/2"-"G" HSS Threaded Shank Stop Countersink Quantity:1 similar to a 12-point boxProduct Description Countersink cutters may be used in all popular adjustable or micro stop countersinking units utilizing a 1 4 28 threaded shank drive. Made from the finest high speed tool steel. Precision ground to exacting tolerances and form relived to insure concentricity of 100 degree countersink angle. Brand Drill America Part Number TSC1 2 G Size 1 2" "G" Material High Speed Steel Finish Uncoated (Bright) Body Diameter 1 2" Shank Type
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