Features and benefits: center-hole feature permits extending adjusting screws, cables, puller screws, etc., straight through the ram. this spring return unit is compact and lightweight. ideal for jobs having restricted working space. set includes 4120 17-1/2 ton, 2″ stroke single-acting hydraulic ram; 4012a pump; 9650 gauge; 24815 tee;9767 hose; and 9798 hose half coupler.