Type: 4pcs Shower Door Roller. Wheel thickness: 5.5mm, comes with screws, suitable for 4-6mm thick shower door. ROLLER DIAMETER: 20mm, inner hole: 5mm, fixed with M6 screw. HIGH QUALITY: The pulley is made of copper + POM wheel, and the screw is made of stainless steel, corrosion resistance and rust resistance, it has good comprehensive performance. BEARING COMPONENT: Pulley bearing capacity, good stability; Small friction coefficient, good mute effect. APPLICATION ANYWHERE: Shower door slides for showers, massage rooms, bathtubs, whirlpools and even for furniture fittings. Ensure that with our slides, the door or doors open easily and smoothly. Replace your broken shower stall rollers with high-quality replacements.