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1"-60 HSS 4 Flute Machine Countersink BoltsandNuts.com Part Number DWDTLCO31/32Product Description 4 Flute countersinks (or machine countersinks) are designed for countersinking holes for centers or for enlarging existing holes Brand Drill America Part Number DEWMSK1 60 Size 1" 60 Material High Speed Steel Finish Uncoated (Bright) Body Diameter 1" Shank Type Round Countersink Angle 60 Shank Size 1 2" Length 4 3 8" Number of Flutes 4