.High quality Easy to install with simple hand . surface is smoother and more corrosion resistant.The cylinder block is made of thickened steel pipe, which has a very high pressure resistance and is not easily deformed. high quality seals, long service life.When we open the trunk, it acts as a buffer, which is more labor-saving, more convenient, and increases the comfort of .Fit for TrunkLoading Grade: Medium Load, : TM 25*40Die Springs for die machinery or other applications.Rectangular section, closed-end design. Die springs are primarily used in die machinery, For Plastic Injection.The loading grade of die springs in various colors (from lightest load to extra heavy load): yellow, blue, red, green, brown.In addition, because die springs are suited for high stress applications, they are also suitable for a variety of other applications as .Colour:redMaterial:metal Sizes:25mm / 1-inch Outer Diameter13mm / 0.5-inch Inner Diameter40mm / 1.57-inch Free LengthPackage Contents:2 x Die SpringsOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.