Spring loaded diamond engraving bit to engrave on hard surfaces like glass, metal and granite.  The spring loaded mechanism allows you to easily adjust the force the bit is pushing on the workpiece.

The bit has a 6.35mm outer diameter to make it compatible with a wide variety of CNC machine spindles, because it mounts to the spindle with a 6.35mm collet.  The spindle can be switched on or off during operation.

The holder is also equipped with a magnet on the inside to hold the bit in place while still being able to swop the diamond tip.  

This diamond engraving bit is available in 2 angles, 90° and 120° angles.  The 90° works better on very hard smooth surfaces like glass and metal. The 120° works better on softer uneven materials like stone and tiles.