Features: The ball bearing slide block is great for you to replace the damaged one in your devices to improve the efficiency and save energy. Adopting 4-point contact design, it can bear load from every direction, and has good strength and high accuracy. Smooth moving, low friction, high rigidity and long life. Economical, easy to maintain replace. Small size, light weight, suitable for most automatic equipment. High accurate and stable performance. Specification: Model: HGH20CA Rail type: interchangeable types Load Type: Heavy Load Block Mounting: Mounting from Top Color: Black Size: Approx. 7.5 x 4.5 x 2.5cm / 2.9 x 1.8 x 1inch Weight: Approx. 408g / 14.4oz Package List: 1 x Rail Block Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.