General description Heavy-duty universal chair castors designed for stability and ease of movement. Includes a single brake system for added safety. Set includes 2 castors with brakes and 2 without brakes. Technical specifications Roller diameter: 38 mm Roller width: 17 mm Mounting height: 53 mm Screw diameter: 8 mm Screw length: 20 mm Capacity: 88 kg (22 kg per piece) Other information Thread diameter: 8 mm