Savior 50MM Big Bore Cylinder Piston Clips Ring Pin Assembly Kit for Stihl TS410 TS 410 TS420 TS 420 Concrete Cut-Off Saw Replace 4238 020 1202 High Qaulity Replacement Cylinder Piston Kit Cylinder diameter is 50mm Fit STIHL TS410 TS420 Replace MPN: 4238 020 1202