Two rails with four sliding blocks designed for precise miniature linear motion in CNC and 3D printer builds. This package includes 2x100 mm linear guide rails in the MGN7C family and 4 carriage blocks, suitable for use with MGN7C, MGN15C, and MGN7H style components. The compact length makes these guides ideal for smallform builds while maintaining robust, repeatable motion. Key benefits Smooth, precise linear motion: enables accurate positioning with consistent movement along the rail. Flexible mounting options: four carriages provide versatile configuration choices for compact assemblies. Compact 100 mm rails: suitable for tight spaces in small CNC and 3D printer projects. Readytoinstall: designed for straightforward integration into standard projects using common mounting patterns. Durability for repeated cycles: built to withstand routine motion in hobbyist to light industrial applications. Key attributes Functionality: dual linear guide rails with four mounting carriages for precise linear guidance. Compatibility: intended for MGN7C rail profiles; compatible with MGN7C, MGN15C, and MGN7H systems in typical setups. Size: two 100 mm rails; four carriage blocks. Material: material specifications not listed in the product title; designed for miniature linear guide applications. Performance: engineered to provide stable, lowfriction motion suitable for CNC and 3D printing components. Applications 3D printer gantry or axis upgrade: improves rigidity and precision for smoother travel along the X, Y, or Z axes. Small CNC router or engraving machine: supports accurate movement of tool heads over short travel lengths. Desktop CNC or mill projects: suitable for compact, precision linear guidance in tight spaces. Package includes 2 x linear guide rails (MGN7C), each 100 mm long 4 x carriage blocks for mounting on the rails Notes Please verify compatibility with your specific MGN7C/MGN15C/MGN7H components and mounting hole patterns before installation. This set is tailored for compact, precise motion in CNC and 3D printer configurations.