Linear Guides MGN Series: 400mm MGN9 linear rail handbook with MGN9H blockThere are 20 holes on the rail for fixing the rail to the machine with nut and screwThere are 2 Transparent rubber stoppers on the ends of the rail in case the carriage falls off the rail, please eradicate them after assembling the rail on your machine if necessary.Style:MGN9Hsize:400mmMaterial:metalcolour:Silver+GreenPackage Contents:1 x MGN9 linear rail instruction manual 400mm length1 x MGN9H carriage block(been put in on the rail)2 x Transparent rubber stoppersOnly the above package content, different products are usually not included.Note: Light shooting and various displays could cause the colour of the object within the photograph a little assorted from the genuine thing. The dimension allowed error is +/- 1-3cm.