SIZE: -16B 5/8 inch diameter ball bearing roller. FEATURES: 360 degree universal fer bearing. CAPACITY: With a load bearing capacity of 33.07 lbs. NOTE: Two screw holes in each bearing,screws are not included here. 1.Ball fer Unit are omni-directional load-bearing spherical balls mounted inside a restraining fixture. 2.360 universal fer bearings is suitable for curved work created on band saws and router tables. Product Name: Ball fer Unit Weight: 260g 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 Color: Silver Material: carbon steel Package Contents:10*Bearing Steel Roller Ball Only the above package content, other products are not included. Note: Light 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.