Transfer Bearing Ball is used for conveying, especially suitable for turning or diverging parts of conveying system. It can make items move easily in a horizontal direction. Features: Flexible rolling; make plate, material bin or other objects glide flexibly. Greatly reduce the labor intensity of workers. Can set arbitrary distribution density according to different load requirements. Convenient to install. Suitable for electronics, hardware, mechanical, chemical, food, forests, mines, books, supermarket, rubber, etc. Widely used in transmission system, processing system, processing machinery and packaging machinery ancillary equipment. Specifications: Housing Material: Iron Surface Treatment: Zinc plating Rolling Ball Material: Nickel Plating Steel Load Bearing: 15kg Mounting Hole Diameter: 4mm / 0.15" Hole Spacing: 40mm / 1.57" Diameter of Ball: 15mm / 0.59" Size: 48 x 32 x 20mm / 1.88 x 1.25 x 0.78" Quantity: 5 pcs Weight: 200g(approx.) Package Includes: 5 x Transfer Bearing Balls Note: 1, Accurate usage of installation is to make steel ball upward. Using in reverse often leads to stuck ball. 2, Please allow 1-3mm error due to manual measurement. Thanks for your understanding.