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

Fixman Gate Castor - 100mm 57kg

Sliding wheel with groove in

Swivel caster Heavy-duty 4-inch rubber spring with capacity load of 99.8 kg

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

5pcs 6 x 30 x 13mm Ball Bearing Pulley with U Groove - Orange

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

Pcs Sliding Gate Wheels 50mm, Steel Wheels with U Groove, U Groove Wheel for Reverse Track, Industrial Machine, Rolling Door, Load Capacity 300kg per Wheel

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

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

Set of 4 Nylon Garage Door Rollers Sealed Ball Bearing with 115mm Stem

Set of 4 sealed ball-bearing nylon garage door rollers with 115mm stem

4 Pcs 50mm Sliding Gate Wheels, Steel U Groove Wheels, U Groove Wheel for Inverted Track, Industrial Machine, Rolling Door, Load Capacity 300kg per Wheel

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

4pcs 4x20x6.5x7.4mm White Inner Dia 4MM U-Groove Nylon Pulley Wheel for Sliding Door

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

Replacement Nylon Rollers for Sliding Garage Doors – Pack of 10 Wheels with 5.1 cm Stem – Also Suitable for Shower Doors

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