Crain 445 classic knee kicker has a recessed trigger for length adjustment in five settings from 17¾" to 21¾". 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. Crain classic knee kicker comes with a gripper cap. Bumper, nap grips, and pin plate are replaceable.