Specifications: Height (block) = 10 mm Width (block) = 27 mm Length (block) = 46 mm Height (rail ) = 8 mm Width (rail) = 12 mm Length (rail) = 250 mm / 300 mm / 500 mm / 550 mm Color: silver (as pictures show) br/> Bearing seat material: bearing steel Weight: 225g / 265g / 394g / 424g Shape: cuboid Suitable for: semiconductor manufacturing equipment; IC circuit board assembly equipment; medical equipement; machine arm; precision measuring instruments; office automation equipment; other small linear sliding devices. Features: -Good quality at a great price -Strong and durable -The tool is simple and easy to use. -Wonderfully designed. -Professional and technical -Small size, light weight, especially for small equipment -The slider can easily and lightly move -With steel ball holder/retainer Package Included: 1X Miniature Guide Linear Slide