Dormer G136 HSS Straight Shank 90° Countersink for production of 90° countersinks in most materials, which can also be used as a de-burring tool. Has a bright finish, 3 flute, ground all over. Other types available on request (MTS, 60°/82°/100°, Coated).Select Option 10.00mm12.40mm16.50mm25.00mm8.00mm Add to Basket Quantity