These are by far, THE BEST HIGH PERFORMANCE RACING ROCKER ARMS MANUFACTUREED IN THE USA!!! AND VERY PROUD OF IT! All Scorpion Rockers feature; Needle bearing fulcrum and roller tip, centerless ground pin & roller, Burr free thru hole in trunnion, large machine seat, thick walled adjusting nut, pedestals machined from solid steel, black oxided coated steel parts and 100% CNC machined. They are available in all rations, they are lightweight for maximum performance and easily handles .950" lift and 950 lbs. of open spring pressure. It clearts 1.625" valve springs and carries an exclusive LIFETIME WARRANTY! They are also BEAUTIFUL! What more can you ask for? A good price, well....we can offer that as well. This is a superior product. 1.73 5/16 Pedestal Mount. Set of 12. On sale for a limited time! Get yours now!