Unique 3-point design makes punching fast and simple. Blanks fall out easily, without prying. Hydraulic sets to 4" with foot or hand pumps. Punches and dies are available individually or in sets, and are interchangeable with most knockout systems. Hydraulic Kits combines ease of hydraulic operation and precision ground knockouts to provide clean, quick holes. Available with foot or hand pumps. * Precision-ground 3-point punch/die sets – Capacity to 4" in 10 gauge mild or 16 gauge stainless steel * Powerful 11 ton hydraulic ram * Pumps equipped with internal safety relief valve * Ram and pump equipped with quick disconnect couplers.