Roller skate with higher quality and longer working time Roller skids with go forward and veered one. Our company Shan Dong Finer Lifting Tools co.,ltd produce all kinds of roller dollies for more than 20 years. Our roller dolly have long working life, easy to handle, durable, and have better after-sale service. Regarding the heavy duty load rollers, the wheels material can be polyurethane, nylon, steel three kinds. The polyurethane material we normally called it PU wheels. Choose wheels material according to your floor when moving. Regarding the machine skate pinch bar colors, it is usually red or blue. But is you want other colors, please noted us, we will make specially for you. Regarding Machinery movers application and pictures, Adjust machinery skates price list and instruction, Load moving skates manual instruction, please kindly feel free contact with us. Professionally service hope will get your satisfaction. Shan Dong Finer Lifting Tools co.,LTD Skype: faithjiang888 Email: [email protected] Website: http://www.cargotrolley.com/