The JCB 25991600 is an authentic OEM hammer installation key, specifically designed for the secure and efficient installation and maintenance of hydraulic breakers on various JCB machinery. This crucial tool ensures proper fitment and operation, contributing to the longevity and performance of the hydraulic attachment. It measures approximately 95 mm in length, 51 mm in width, and 10 mm in height, with a weight of 0.12 kg.