Instructions: 1, the head inserted in the middle of the gap between the knife head, the appropriate tighten the head nut, you can use. 2, holding the same method with the pen, force should be appropriate. 3, in order to protect the blade, carved paper should be under the mat on the mat Type,Craft Engraving Knife Material: Plastic Size 98*34*24 mm Handle Aluminium alloy Blade Material.: Sk5 Hardness of blade: 60 +/-2 HRC Package: Head Double Blister / Sliding Card / Paper Tie Card / Plastic Hanger / Flag label