General description This CCYKXA 10Pcs Bearing Trolley Set is designed for smooth operation in sliding rail applications. It features a trolley assembly roller that ensures stability and prevents dislodging, making it ideal for sliding doors or windows. Technical specifications Diameter of beam hanging pulley: 23mm (0.91in) Thickness: 6.5mm (0.26in) Hole diameter: 5mm (0.2in) Total length: 49mm (1.93in) Width: 23mm (0.91in) Usage Suitable for sliding doors and windows Not recommended for heavy-duty barn door installations Other information The sliding wheels are made of stainless steel and nylon, providing good toughness, wear resistance, and impact resistance. Set includes 10 pieces to meet multiple installation needs.