Whether you're working on wood, metal, plastic,ceramics or glass, this precision tool will give you precise hairline marking ability. Next to diamond, tungsten carbide is considered to be the hardest material known.</br></br> The carbide scribe pen can be used to score glass for glass cutting,with a carbide tip,it could be used as a window breaker if you want.</br></br> It is QUITE sharp, and helps make very accurate scribe lines,the magnet is an extra handy feature.</br></br> Comfortable to use and works very well with minimum pressure,could be used it on plexiglass and copper with great.</br></br> <b>Features:</b></br></br> Type: ordinary glass Engrave Scriber Tools.</br></br> Material: Tungsten steel.</br></br> Size: Length=150mm,Diameter=6mm.</br></br> Cutting thickness: 5mm.</br></br> Package include:4xTip Scriber Etching Engraver Pen.</br></br> <b>Note:</b></br></br> 1, The nib is very sharp, please be careful when use it,please capped it and put into bag when it leave unused.</br></br> 2, There is 2-3% difference according to manual measurement,it is normal,thanks for understand.