Overview Reviews Product Description Premium cobalt (8%) 130° Notched point Cobalt substrate for increased hardness and toughness Black oxide finish for increased wear resistance and added lubricity Slow spiral (15° Degree helix) for added strength and rigidity when drilling harder materials Designed for heavy duty drilling in work hardened and heat-treated steels such as such as Hardox 400 and Hardox 500. Clarkson Osborn Catalog Product Videos Custom Field Diameter 9/32" Flute length 2" Overall length 5-5/16" MTS size #1 Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn 9/32" x #1 Cobalt Morse Taper Armour Piercing Drill Bit DR34018 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *