SIZE: -16B 5/8 inch diameter ball bearing roller.MATERIAL: Housing be made of carbon steel material.FEATURES: 360 degree universal transfer 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 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 UnitColor: Silver ToneWeight: 520gModel: -16BCapacity(Max.): 15kg/33.07lbBall Diameter: 5/8-inchDimension: 45 x 19mm/1.8-inch x 0.75-inch(Max.D x H)Mount Hole Dia.: 4mm/0.16-inchMount Hole Distance: 30mm/1.2-inchPackage Content: 12pcs x Ball Transfer UnitOnly 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.