The purpose is the strength and flatness of glass fiber reinforced , save resin, save for time and cost, improve construction efficiency and product quality. Widely used in the production of glass fiber reinforced , to the compaction resin coating and drive . Usually used for products inside the and the of the ball roller puncture, commonly used in glass steel production tools, can effectively improve the work efficiency and product quality. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!