Spare Blade for KUM Long-Point Sharpeners, 3 Blades. KUM Spare Blade for Automatic Stop Long Point Sharpeners. Two-Blade System: One blade shapes the wood and the other shapes the lead to an extra long precise point. For best performance, please replace both blades. The blade is curved, not flat, rust protected, hard and sharp. 3 KUM BLADES for longpoint sharpeners KUM 303.57.21 and KUM 104.06.01