This Roller handle gives you an entirely new “feel.” A roller handle reduces operator fatigue during long reloading sessions and makes primer seating easier. Extremly easy to assemble. Just unscrew your ball and screw this aluminum ball bearing roller handle. It fit’s Hornady reloading machines. Extremly low friction thanks to integrated two ball bearings. Finger grooves also improve your grip. Roler is made from Aluminum (Red anodized). Screw ball is made from stell.