Adjustable Leather Creaser: Rotate the screw to adjust the width of the blade(min:1.5 mm-max:5.6mm). Please adjust the size you want. Great for creating stitching and lacing lines or marking edge prior to tooling when crafting leather belts, straps, wallets, bags, holsters or saddles. Leather Fat Cutting Knife: used for shaving thin layers off of leather and the skiving knives have a wide edge ground to an angle with a flatter handle for working closer to the of your piece. The leather creaser blade can be used to make crease along a borders, parallel lines for tooling and lines for punching lacing (Reminder:Leather Creaser Heating without blackening,the effect of the lines pressed out is good.)