10mm Diameter APERTURE-4XD High Performance Carbide Drill, 140? 4-Facet Point, nACRo Coated, 40mm Flute, 100mm OAL 40mm Flute Length,10mm Shank,100mm OAL GWS/Monster 2 flute Aperture-4X carbide drills are made from C-2 Sub-Micron Grain Carbide With 10% Cobalt Content. Proprietary 140? drill point technology utilizes a perfected combination of facets, corner breaks, and edge prep to produce the strongest cutting action. nACRo coating provides unrivaled lubricity and temperature reduction. 4xD perfectly blends the rigidity of 3xD and the versatility of 5xD. This self-centering drill provides the fastest penetration and ultimate tool longevity. Made in the USA. GWS/Monster Tool Part #434-003937B