Product Name: Auto Gas Spring;Material: Metal;Color: Black, Silver Tone Force: 5kg/ 11 lb;Stroke: 90mm / 3.5';Thread Diameter: 8mm / 5/16' Rod Diameter: 6mm / 15/64';Tube Diameter: 15mm / 3/5';Tube Length(Black Finish): 120mm / 4.5' Length( screw center to screw center): 250mm/ 9.8';Total Length: 260mm / 10.2' Package Content: 1 x Gas Spring