Excellent handle grip and blade with serrated edges. Handle: it is ergonomically designed to reduce the fatigue when holding the handle for long periods of time. Blade: Depending on the appearance of the sebaceous bone, a variety of sizes and shapes of the blades can be selectively used. The serrated edges of the blade are able to secure the sebaceous bone. It avoids slipping into the gum and tearing the reflected tissue. 4 types of blades can be selectively used by the shape and angle of the surgical site. Includes KTN1S blade, KTNNH, KTNWT(wing), KTNSS (autoclaving cap). Shape Memory (Ni-Ti model). After the blade is bent, the blade will return to its original shape after sterilizing at a high temperature in the autoclave. Includes KT1N blade, KTNWT (wing), KTNSS (autoclaving cap).