GA series rail carriers adopt dovetail structure, match GB series optical rails with convenient adjustment and good repeatability; installation holes of various hole sites with strong suitability may be installed our various adjustment mounts; various widths fulfiil different distance needs; especially GA104 carriers whose adjustment mechanism is M6X0.25 high-precision adjustment screws and precise linear leadscrew is guidance may be horizontally fine adjusted with spring reposition, high precision and good stability.