Professional tool for commercial or occasional use Impact tamper torx bits Manufactured form chrome molybdenum steel for strength and durability 1/4" and 3/8" drive so will fit all 1/4" and 3/8" ratchets / power bars Tamper Torx bits so will for Torx bits as well as security bits (the bits with the hole in the centre) 10pc tamper torx bits SET INCLUDES THE FOLLOWING SIZES - 1/4" Drive Sizes - T10 / T15 / T20 / T25 / T27 / T30 - 3/8" Drive Sizes - T40 / T45 / T47 / T50 Comes on a socket rail for easy storage and transportation Stubby Tamper Torx bits for access into restricted areas.