Ridgid 23477 Hydraulic Knockout Kit. This kit includes precision ground 3-point punch/die sets and a powerful 11-ton hydraulic ram. The pump comes equipped with an internal safety relief valve2 draw boltsa draw barspacers and a 3-foot hose. This Hydraulic Knockout Kit combines the ease of hydraulic operation and precision-ground knockouts to provide cleanquick holes. The ram and pump are equipped with quick disconnect couplers.