Drilled tips allow use on tamper resistant security fasteners chrome molybdenum steel construction for strength and durability mirror polished chrome plated finish resists corrosion patent pending textured finish for improved grip color coding for easy identification and laser etched size markings are easy to read this extra long arm torx key set contains the following sizes: t6, t7, t8, t9, t10, t15, t20, t25, t27, t30, t40, t45 and t50.