Check the listing for details. 19/64 x 6 HSS Aircraft Extension Drill Bit. Condition: New. Listed at 17.50 USD. 19/64 x 6 HSS Aircraft Extension Drill Bit A dependable, general purpose drill bit ideal for production, maintenance or portable drilling jobs. For use in a wide range of materials such as aluminum, brass, copper, metal, plastic and wood. Surface treated with abrasion-resistant black oxide. Made of high speed steel with a 135° split point tip. Round shank for use in a wide range of tool holding systems.A dependable, general purpose drill bit ideal for production, maintenance or portable drilling jobs. For use in a wide range of materials such as aluminum, brass, copper, metal, plastic and wood. Surface treated with abrasion-resistant black oxide. Made of high speed steel with a 135° split point tip. Round shank for use in a wide range of tool holding systems.