Compatibility: All these accessories could work on 3018PROVer/ 3018PROVer Mach3/ 3018MX3 CNC Router Machine. CNC Router Emergency Stop Switch: Easy to operate, push to stop and lock. You could use it to stop the machine safety and immediately once you found something wrong when engraving. Z-Axis Tool Setting Touch Probe: With a mouse click, CNC machines will automatically return to a predefined position, allowing you to easily change and calibrate your tools. Saved you so much time determining the Z location for CNC bits over the manual paper test method. These mini switches features NO contact, momentary action and come with 1m 3-pin cables. Easy installation and long service life. It's a perfect upgraded accessory for CNC without a limit switch.<br><br>color:Black+red Material:Plastic + Metal<br><br>Package Contents: 1 x Emergency Stop 1 x Z-Axis Tool Setting Touch Probe 6 x Micro-Limit Switches with 1M 3 Pin Cable<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.