General description For use on Girling brakes, the Laser Tools Pentagon Socket Bit is designed to save time with its 1/2" drive and 10mm size. This socket is manufactured from durable Chrome Vanadium, while the bit is made from S2 silicon steel, ensuring longevity and reliability. Technical specifications Drive size: 1/2" Socket size: 10mm Material: Chrome Vanadium (socket), S2 silicon steel (bit)