Professional and technical rails blocks, strong and durable. Block has a lubrication system, lubricating oil can be easily introduced into the oil inlet on the side. Low friction, low noise, quiet and stable. Widely used for automatic devices, precision measuring devices and many other machines that require precise linear movements. Features - Color: Assorted color. - Material: Alloy steel. - Size: 4.00 x 1.70 x 0.70cm/ 1.57 x 0.67 x 0.28 inch. -Note: Random Style - Adopting 4-point , it can bear load from every direction. - Has good strength and high accuracy. Slider could easily and lightly move for convenient use. - Linear guide block has lubrication system, lubrication oil can be easily put into the oil inlet on the side. - This linear rail set designed with , which allows interchangeability in the case of small precision. - The professional linear rail guide and carriage blocks are portable and lightweight, especially suitable for most automatic equipment. Package list: 1 x slider