2 Holes Flange Mounted Ball Transfer Unit 2 Holes Flange Mounted Ball Transfer Unit with one inch (1"=25.4mm) main ball, it is used for heavy duty loads, the unit has 2 holes to be fixed, can be used to build a multi-direction conveyor, moving goods, feeding machines and many more, the rest is for your imagination to build a new design or create a new idea. Dimensions (mm) d D D1 D2 D3 L1 L2 L3 5.5 25.4 71 55 40 16 3 13.5