Rapidaptor R8 Quick Change Tool Holder Kingmann-White For Bridgeport J Head Mill. Comes with 3 end mill tool holders and one master that fits an R8 spindle j head Bridgeport milling machine. May fit other knee mills but please check your spindle nose od as this style slides around it and is also pulled up by the draw bar. Be sure to view our other items for more great tooling finds.