Professional spline bits for commercial or occasional use Impact spline bit and holder set 1/2" drive so will fit any 1/2" drive ratchets, extensions, power bars etc... Manufactured from chrome vanadium steel for strength and durability Impacted so suitable for use with impact guns or high torque tools Triple square spline / 12 sided sockets this limits the amount of wear on the corners of the fastener and the socket as you have more sides / teeth on the socket biting onto them Interchangeable bit set so one 1/2" drive bit holder with 9 different size bits Sizes range from M6 – M18 Total length of the spline bits – 35mm SET INCLUDES THE FOLLOWING SIZES • M6, M8, M9, M10, M12, M14, M16 and M18 Comes in a blow molded tray for easy storage and transportation