1.Ball Transfer Unit are omni-directional load-bearing spherical balls mounted inside a restraining fixture. 2.360 universal transfer bearings is suitable for curved work created on band saws and router tables. Product Name: Ball Transfer Unit Color: Silver Tone Weight: 260g/Set Model: -16B Capacity(Max.): 15kg/33.07lb Ball Diameter: 5/8-inch Dimension: 45 x 19mm/1.8-inch x 0.75-inch(Max.D*H) Mount Hole Dia.: 4mm/0.16-inch Mount Hole Distance: 30mm/1.2-inch Package Content: 18 pcs x Ball Transfer Unit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.