Universal Ball is suitable for all walks of life, such as machinery, hardware, chemicals, food, supermarkets, airports, warehouses, etc. Due to the flexible rolling of the general ball, working boards, material boxes, etc. can be moved flexibly, which saves artificially. According to different bearing requirements, the distribution density of the general ball can be set at will, and you can also choose a universal ball with different bearing capabilities. Universal balls: carbon steel balls, carbon steel galvanized balls, steel balls, plastic steel balls, nylon balls. All kinds of universal balls are suitable for all walks of life, such as electronics, hardware, machinery, chemicals, food, forestry, mining, books, supermarkets, rubber, etc. Colour:Silver Material:Stainless steel Size:19D Package Contents: 4 * Ball Wheel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.