4 pcs. Stainless Steel Rope Pulley Double Drives Low Noise Rollers For Sliding Door Feature:1.4 pcs. In 1 set: Includes 4pcs sliding pulleys, with standard size and enough quantity to easily old or damaged pulleys.2. Stainless steel: These sliding shafts are made of excellent stainless steel, which is rusty and corrosion-resistant and has a long service life.3. Double drive: These sliding door pulleys are double drive design, which is smooth and noiseless in operation, sliding freely without stuttering.4. Easy to install: The silent sliding pulley has standard size and mounting holes, easy to install and not easy to fall off, which is safe and reliable.5. Wide Application: Widely used in sliding door, sliding window and cabinets, etc. to replace damaged sliding rollers, with great practicality. Specification: Item Type: Door Sliding Roller Material: Stainless Steel Roller Outer Diameter: Approx. 11mm/0.4in Base Length: Approx. 65mm/2.6in Base Thickness: Approx. 16mm/0.6in Mounting Hole Diameter: Approx. 5mm/0.2in List Packing: 4 x Pulley Note: Please adjust the right size before installation.