Bearing Steel V Groved Wire Pulley Bearing Wheels Roller 5x22x5mm, 5 Pcs V-groove traces pulley bearing , set of 5. This item is ordinary precision, adaptation to low speed, low load applications Material:High quality bearing steel Dimension:(Inside diameter)5mm x (outer diameter)22mm x (thickness)5mm V-groove width: 3mm.V-groove deepness: 1.5mm