JAW CLAMPING PISTON'S INNER SET FOR KN 67 HBA TYPE WELDING MACHINE. 1 SET CONSISTS 1 PCS PISTON SHAFT, 1 PCS SHAFT BUSHING, 1 PCS PISTON CYLINDER, 1 PCS PISTON SEAL KIT, 1 PCS MOLD SPRING AND HYDRAULIC FITTING PARTS.