A splined socket and 12 point (Bi-Hex) wrench designed to allow the differential pinion to be held while the pinion nut is removed or tightened. 2 piece set including 1/2"D spline pinion socket with 1/2"D pinion nut wrench.Applications include: Range Rover (2013 - 2016), Range Rover Sport (2014 - 2016). Pinion nut wrench also suitable for Discovery (2017 - 2019). Pinion nut wrench equivalent to OEM JLR-205-994, JLR-205-996, BMW 33 5 050 (BMW use a different spline socket).