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3/8"-#40 HSS Threaded Shank Stop Countersink - High Performance & Durable Cutting Tool | Drill AmericaCountersink 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. Product Specifications: Size: 3 8" #40 Material: High Speed Steel Finish: Uncoated (Bright) Body Diameter: 3 8" Shank Type: Threaded Countersink Angle: 100 Key

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