_x000D_ [Stainless Steel Material] Our 4-wheel trolley roller is made of high quality stainless steel material, which has low resistance and smooth operation. It has high printing accuracy and silent to use. It is wear-resistant and rolls smoothly, as well as high hardness and strong load-bearing. [Stable and Silent] This trolley assembly rollers kit is smooth and silent to work without noise. The bearings and pins are firmly welded. It is stable and will bright you good strength and quality. [Easy to Use] You can use these strength and quality to install ceiling trolley system or electric elevator. It is also suitable for using on your DIY projects, and can be used upside down. [Widely Uses] The package includes 2pcs trolley assembly rollers, suitable for household sliding doors, wardrobe cabinets, curtains, large iron doors, automation equipment factory track pulleys and more. [After-sales] If you have any questions, please get in touch with us, our service team will provide you with a professional and satisfactory service. Product Name: 4 Wheel Trolley Rollers Size: 14cm Material: Stainless Steel Color: Silver Notes: 1.There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color. 2.Please allow slight dimension difference due to manual measurement. 2Trolley Assembly Rollers _x000D_ _x000D_