ITEM NAME:New 10pcs steel U Groove Guide Pulley Rail Track Ball Bearings Wheel 4x 13x 7mm New 10pcs U Groove Guide Pulley Rail Track Ball Bearings Wheel 4x 13x 7mm SPECIFICATIONS.(Item included: 10 x U groove ball bearings. Size: (ID) 4mm x (OD)13mm x (thickness)7mm. 2) Suitable for processing ordinary steel, iron, steel mold. Low load applications (ordinary precision). Note: the item is coated with a layer of grease to protect them from getting rusty.
