Feature: 1. U-drill shank drills multiple short chips, and can use the internal cooling system to safely remove chips, which is conducive to the continuity of work 2. The hole made by drilling has good surface finish and small tolerance range, which can be used instead of some rough drill 3. The use of drilling technology can not only reduce drilling tools, but also because of the way the head is inlaid with cemented carbide, make its life more than ten times that of ordinary drills 4. Cemented carbide material, possess high hardness, wear resistance, strength and toughness 5. U drill shank have stable structure, excellent performance and long service life Specification: Item Type: U Drill Shank Specification: C25-3D18-57WC03 (18x3 times the diameter) Material: Carbide Outer Edge Angle: 45° C25 represents the handle, Straight Handle Thickness: Approx. 25mm / 1in 3D18: 3D represents 3 times the diameter, represents the blade length, Diameter: Approx. 18mm / 0.7in , 3D18 represents 3x18 = approx. 54mm / 2.1in(blade diameter length) 57: Represents the effective processing depth. Package List: 1 x U Drill Shank1 x Screwdriver1 x User Manual