Convenient to install: Simple design with long wires makes the Z- router tool setting touch probe easy to use on large CNC tables. What's more, the probe plate portion itself is sufficiently weighted to stay down and in place on it's own. Work well: This package includes 2 pieces of CNC router Z- tool touch probes, sufficient quantity would meet your demand. When configured with your G-code sender and CNC machine, this product makes finding the Z- zero quick and simple. Product use: various engraving machines Knife : diameter 25mm Line length: 1.2m Specification: knife setting block (with double wire) Power mode: AC Use: suitable for processing wood, acrylic, plastic, aluminum, iron, steel and other materials Material: Metal + Plastic colour: black+red Package Contents: 2 x CNC router Z- tool touch probes Only the above package content, other products are not included. Note: Light 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.