Classic Features Unique design maintains 25 degree angle 325 Grit Diamond Rods Ultra compact Easy to use No adjustments Also available in RED and BLUE Same Angle Same Pressure Both Sides Every time! The Curve is an incredibly easy to use, high-quality sharpener for quick action. With non-adjustable rods all you need to do is keep your blade flat against the Guide and let the sharpener do the rest. The unique curve in the Diamond Rods maintains a 25 degree angle throughout the entire blade. Spring loaded Diamond Rods keep equal pressure on each side while pulling the blade through.