The telescoping steel tube construction of the No. 505 makes it one of the most durable knee kickers available. The double buttons provide four length adjustments from 21″ to 25″. The visual pin depth dial provides nine different depth settings for various carpets. Power rods extending through the pin plate provide support and improved force transfer to the carpet. The gripping head includes three nap grips and a pin plate with 16 hardened steel pins. The standard thickness bumper is made from rubber for durability and provides a firm feel and impact that is preferred by many installers.