Dampers Extension Only Material Steel Max Weight 405 lb Locking No Rod Dia 0.31 in Cylinder Dia 0.87 in Fitting Type Elbow Fitting Thread Size M8 Ball Diameter 0.39 in Stroke 3.94 in Extended Length 12.2 in Compressed Length 8.27 in Fixed Resistance No Adjustable Resistance Yes Damper Type Extension Only