Check the listing for details. HGW15CC Linear Slider Block, Bearing Carriage Block & Grease Fitting, Black. Condition: New. Listed at 23.06 USD. Description:Material: The linear slider block is made of bearing steel, which is wear-resistant, pressure-resistant, strong in load-bearing capacity, and non-deformable. It also offer good dimensional stability, ensuring smooth and stable operation.Highly Precise: This precision linear carriage block features a smooth surface that reduces rolling friction for smoother, quieter operation. Its optimized ball path ensures high repeatability and accurate positioning. Easy to Install: Install the mini linear guide to the sliding carriage block, placing the carriage block parallel to the guide rail, and gently push the carriage block into the guide rail. Until the slider is fully inserted into the guide rail, the steel balls will not fall out, indicating a successful installation.