Description: Features: 100% brand new and high quality Been installed on the plastic rail in case of losing the steel balls. Small size and light weight. Slider could easily and lightly move. Professional and technical block, strong and durable to use. High accuracy and stable performance, can work fluently. Suitable for CNC XYZ machine DIY. Easy to install. It worked great and had no resistance in the bearings when put on a rail. Applied in semiconductor manufacturing equipment, printed circuit boards, IC assembly equipment, medical equipment, robotic arms, precision measurement machine and other small linear motion device. Specification: Material: Steel Dimensions: 4.3x2.6x1cm(1.69x1.02x0.39in)(approx) Color: As pictures shown. Quantity: 1 pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x MGN12H Slide Block(other accessories demo in the picture is not included.)