CYLINDER KOMPLETNY PILARKI CHIŃSKIE NAC CST61-50AC, CST61-50AOW Piston diameter 48mm Ring thickness 1.5 mm (2 pieces) Piston pin 10mm x 40mm Reference No. This is not an original spare part, but a high quality (OEM) replica part in OEM quality. Original part number and brand names are for comparison purposes only.