This "double button spring clip" knee kicker has adjustable depth settings and feature a pin plate with four rows of four hardened steel pins with nine depth adjustments in 1/32" increments. Each pin plate also includes two 'Power Rods' for best force transfer. The pins can be completely retracted to permit use of the three nap grip inserts (cotton head) on lightweight or low pile carpet. The knee kicker comes with a snap on plastic cover to protect the pins when not inn use and a seamless foam filled bumper that can be rotated for even wear. Black powder coat finish. Instructions and an illustrated parts list are included. The knee kicker is guaranteed for three years.