5/16"-100 HSS 6 Flute Chatterless Countersink Quantity:1 There is a deep knurled

There is a deep knurled grip in the middle of the tool

Part Number: 50F450HCSL9Y

Part Number DWC26MM-4FSE

offering a more secure and gentler hold on a variety of materials

There is no thumb knob to tighten at the end of the handle

5/16"-100 HSS 6 Flute Chatterless Countersink Quantity:1 There is a deep knurledProduct Description 6 Flute chatterless countersinks are designed to provide more metal removes than the 1,2,3 and 4 flute countersinks. They are also more effective on harder materials. Brand Drill America Part Number DEWCHAT5 16 100 Size 5 16" 100 Material High Speed Steel Finish Uncoated (Bright) Body Diameter 5 16" Shank Type Round Countersink Angle 100 Shank Size 1 4" Length 2" Number of Flutes 6