... ,25CrMo LENGTH:3M-6M We can supply the guide rail,if you require this ,please contact me,send me ... the drawing ,thanks!Guide ( daogui ) guide rail: metal or other material groove or ridge, can bear, fixed ... fixed machine parts, special equipment, instrument and so on. Rail is also called slide, linear guide, linear slide, for beeline ... load in case of high accuracy linear motion. guide rail