ROUND STAINLESS STEEL BARREL ISO 6432 CYLINDER WITH ISO 16030 "G" PORTS D=20 STROKE : 12 WITH DOUBLE ACTING, STAINLESS STEEL SINGLE ROD AND STAINLESS STEEL ROD NUT , NOT CUSHIONED PISTON, FPM ROD SEAL, PREPARED FOR MAGNETIC DETECTION, WITH STAINLESS STEEL COVERS.