Effortlessly sharpen your used, dull rotary blades ergonomically, economically, and quietly. Turn-Sharp features a comfortable grip knob that turns easily for left-or right-handed use. The turner locks the blade in place with the correct amount of pressure for perfect sharpening. Turn-Sharp includes the original Tri-Sharp sharpener for 45mm blades. It can also be used with 28mm and 60mm Colonial brand rotary blade sharpeners.