The Huopo 7.5 inch 20lbs Cap.High Pressure Gas Struts are designed for use with Sentry Safe Carbon Steel tool boxes. Made of durable carbon steel, these black gas struts provide an operating force of 20 pounds and offer high pressure performance. The kit includes 2 struts, 4 brackets, and 10 screws for easy installation. With a compressed length of 5.12 inches and an extended length of 7.5 inches, these gas struts are reliable and efficient for securely lifting and supporting the lid of your tool box.