Size: 28MM. Item model number: Oil Filter Socket. High Quality:made from high grade aerospace aluminium, weighing only 44.3g, it makes your tool box lightweight.built with high-precision cnc technology,size accurate good fit no sharp corners high strength and durablity, no deformation, The 6-point hex features rounded corners to create a tighter fit while also preventing the filter socket from binding or rounding off the filter canister.