OEM Coolant Through Flat Bottom Carbide Drills For Blind Hole Machining. Changzhou AMG Precision Tools Co.Ltd. is a manufacturer specializing in the production of solid carbide cutting tools, including end mills, drills, reamers and customized non-standard tools. We are equipped with advanced German Walter grinders and Zoller measuring instruments to ensure that each product has excellent precision and consistency. Specifications: Product Attributes Attribute Value Name Flat Bottom Carbide Drill Application Aluminum alloy, copper alloy, non-ferrous metals Features Smooth surface finish Type Step drill Coating DLC/Uncoated/Ti Al NCool