Hookcart Engraving Pen For Metal Plastic Steel Wood Glass With Extra Tool Nib, Pasck of 1. You can use this pen on wood, steel, glass, metal, plastic, leather, and cardboard. It works seamlessly on many surfaces and gives you brilliant results too. Just press the button with your thumb and you’re ready to etch the surface with any sort of shape or letter. It lets you decorate and entitle gifts, trophies, and many other items. 2 tips become useful for DIY projects, shops, and businesses in which you need to make permanent markings.