This Techni-Pro TNP-27BLADE-REPR-TL hobby knife set is made for all kinds of model making, etching, carving, degumming work. Comes with an aluminum handle (13cm) with textured grains on surface for anti-slip grip. The metal blade is surgically sharp with a plastic cap to keep the blade secure. There are 27 interchangeable blades; easy to replace; just rotate the installation end of the handle. Comes with small plastic case to store all blades. Keeps them organized and secure.