Durable material: The glass tip has a durable tungsten carbide tip and an aluminum body, so it can easily handle hard materials including hardened steel, stainless steel, ceramics and glass. Disposable briquette tungsten carbide blades are more durable than others and are not easy to drop. Magnetic: The permanent magnets of this engraving tool pick up small parts and collect filings from steel hard-to-reach places. Comfortable use: practical pen design and practical pocket clip, knurled aluminum handle for maximum control and comfort. Easy to Store: When not in use, the tungsten carbide tip can be reversed. Replaceable: There are 4 free replacement marking tips. Advantage: 1.Robust construction built to last 2.Simple and comfortable to use 3.Easy to transport and store 4.Four free replacement tungsten carbide tip 5. Wide application 6.Excellent after-sales service Specifications: Size: Length: 137mm Weight: 18.2 g Writer material: aluminum, tungsten carbide, magnet Package content: 4 x carbide tips 4 x replacement tips