Roof Top Rail Yoke Riveter. Designed for installing 3/16" and 1/4" rivets on most tractor roof rails. With the low profile C-Yoke it makes for easy installation of rivets in the confined space of upper roof rails on enclosed trailers. The rapid rivet upsetting action and return of the riveter reduces job time. Requires at least SM210 flush set for the top of yoke and choice of additional cupped rivet set to be inserted in the moving set holder.