For%20deburring%20and%20sharpening%20edges.If%20you%20like%20your%20board%20or%20skis%20to%20be%20catch%20free%2C%20de-tune%202%26quot%3B%20north%20and%20south%20of%20the%20contact%20zones%2C%204%20points%20of%20contact.%20Use%20a%20Gummy%20or%20a%20Ceramic%20Stone.%20Start%20on%20the%20edges%20as%20they%20curve%20up%20into%20the%20tail%20and%20nose%20and%20dull%20lightly%20approximately%202%26quot%3B%20from%20being%20flat%20on%20a%20table%20in%20both%20directions%20for%20a%20total%20of%204%26quot%3B.%20Sold%20in%20singles.SpecificationsSize%3A%203%2F4%26quot%3Bx4%26quot%3B