H-type pulleys are used for curtain tracks. They are silent, adjustable, simple small track wheels with ball bearings.

Sliding wheel with groove in

TIMCO Spring Loaded Field Gate Wheel Heavy Duty Black - 370mm

2 Rolling Gate Wheel 6cm, Extension Gate Suspension Caster, Gate Support Caster for Wooden Garden Gate, Yard Fence, Load Capacity 50Kg

Door Bottom Guide, adjustable floor guide, anti-scratch wheels with ball bearing, for framed sliding door, silver, 2 pieces（Adjustment range：10mm-35mm）

2 roller shutter wheels 6 cm, suspension roller for extendable gate, gate support roller for wooden garden gate, yard fence, load capacity 50 kg

4 pieces single roller for lifting reeving - sliding gate guide rail - 55 mm V-shaped grooved wheel - for ropes, steel cables etc.

Roulette Portail Battant, Roue pour Portail Battant, Support de Roue de Porte de 4", Capacité de Charge Résistante de 220lbs, Roue à Ressort de Porte en Caoutchouc pour Portes de Ferme en Bois-QttvbTn

Courtyard door rail guide wheel sliding door nylon wheel industrial nylon pulley various specifications

Spring Loaded Gate Wheel 4" x1 (Heavy Duty Sliding Fence Support Jockey Door 100MM)

CCYKXA 4Pcs Nylon Sliding Barn Door Rollers Wheels Pulleys for Electric Garage Sliding Doors Accessories 30x40mm

White nylon rollers with U-groove for sliding doors, size 20x6.5x7.4 mm

Grooved industrial wheel, directional wheel, rigid steel wheel, swivel caster, U-groove wheels for sliding gates, cable rails, turning rails, set of 4 (2 inch/50 mm)

120mm round groove wheel with 8mm groove for cable grooved wheel for gate

50mm V-groove wheel – Galvanized steel – 270kg capacity per wheel – For sliding gates with double bearings