Size: Length=150mm,Diameter=6mm., Cutting thickness: 5mm. The carbide scribe pen is the perfect tool for making sharp accurate lines on hardened materials like hardened steel,stainless steel,ceramics and glass; Durable Cutting Tools: The glass cutter adopts an ultra-strong diaond carbide blade with solid hardness and sharp cutting to guarantee sooth operation Next to diamond, tungsten carbide is considered to be the hardest material known. Whether you're working on wood, metal, plastic,ceramics or glass, this precision tool will give you precise hairline marking ability. Chiloskit Engraving Tool Scribe Metal Glass Tungsten Carbide Tip Unique Bargains 6' Tungsten Carbide Tip Scriber Etching Engraving Pen with Clip. Current price is CADNow $9.99 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. Features: Type: ordinary glass Engrave Scriber Tools., Material: Tungsten steel. Durable, mechanical pencil type holder prevents stick breakage and features a convenient, built in sharpener; Carbide Tip Scribe Tungsten r Etching Pen Carve Jew... - Grandado Hard Material Marking Tool This scribe has a finely honed needle sharp point mounted in a 6 inch long stainless steel handle,and the diameter is 6mm;