Roc-it Dog convex blades are designed to provide smooth, effortless cutting by using the same expert honing techniques that are used on Centrix shears. The offset grip found on all Roc-it Dog shears provides a relaxed "open hand" grip for low stress cutting and improved cutting speed. The tension knob/tension screw are both specifically designed for each shear model to extend the life of the blade while being easily adjustable for each haircut.