Sliding Window Wheel WU-30/10 1. Item No.: WU-30/10 2. Material: POM 3. Size: 20 (OD)*5 ( ... : white Product Name: Sliding Window Wheel Roller with Ball Bearing WU-30/10 (Doors & windows wheel, door wheel, nylon wheel, plastic ... .en.alibaba.com Sliding Window Wheel Roller with Ball Bearing WU-30/10