10mm (across points), 8 point internal castellated socket. 1/4" drive; length: 50mm; O/D: 14.5mm. Applications include: Nissan NV300, Renault Trafic and Vauxhall/Opel Vivaro. Specificially designed for the removal of the inlet tract housing bolts on the R9M 1.6L turbo diesel engines. Black finish with knurling for better grip.