These handy mounts are bolted to the wrecker deck by four bolts and nuts (supplied). They make the vertical storage of the BlackJack21 very convenient and secure. There is a lynch pin with keeper held by a lanyard that contains the rack bar of the BlackJack21 within the mount. (A ½” hole must be drilled in the blackjack rack bar approximately 1-3/4” from the end.) It measures 4.25” x 4.25” and stands 6” tall. Painted black. Sold as each piece.