2.5 Inch Diameter 65mm,thickness 33mm,u Groove Sliding Nylon Rollers/wheels With Two Double Bearings 6001rs Bore 12mm. - Door Rollers - AliExpress
4pcs U-Groove Pulley Roller Guide U Type Wheel for Hardware Doors Windows - Walmart.com
u groove track roller bearing SG20| Alibaba.com
1PCS Deep U Groove Round Bottom Bearing Track Roller Wheel Stainless Steel Guide Pulley Rail Ball Rolling Bearing 8x22.5x14.5mm: Amazon.com: Industrial & Scientific
U Groove Pulley 4Pcs U-Groove Roller Guide Wheel Nylon Guide Roller Wheel for Doors Windows Cabinets Drawers 5x25.5x8.5mm Blue: Amazon.com: Industrial & Scientific
Amazon.com: Letool 4pcs U type groove pulley nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows : Industrial & Scientific
LFR50/5-4NPP 5mm ID x 4mm U Groove Track Roller Bearing Track Bearings - Walmart.com
2pcs U Type Groove Pulley Nylon Roller Bearing 5x27.5x30mm U Groove Guide Wheel | eBay
5" x 2-1/4" U-Groove Wheel - caster wheel distributing company, heavy equipment, caster wheels online
U-Grooved Wheels: Capacity: 600 - 16,000 lbs. Hamilton Caster