Compatibility: This z- lift device is suitable for TT-5.5S, TTS-25, TTS-55, TTS-10 laser-engraver without modifying the device. not fit engraver without adapters or mod. Quality Built: This device is well designed and constructed, very solid and the action is smooth, without backlash, very precise, it makes precise laser-adjustment very easy. Focusing is More Convenient: Just turn the knob to adjust the height of the z- laser-module. It made adjustment of laser-so much easier. It can remove all excess play between the laser-and the project. Large Adjustment Stroke: The maximum lifting stroke is 55mm, which enables the laser-to engrave thicker items, such as skateboards, wood etc. , does not affect the speed and accuracy of the XY of the engraver.