Check the listing for details. StewMac Gauged Nut Slotting File for Guitar .046" Width. Color: Multicolor, Size: 8.5, Condition: New, Style Code: AW5313. Listed at 23.10 USD. Ensure your strings seat properly in the nut without buzzing! Our tempered edge-cut nut files produce round-bottom slots for nuts and saddles. Each chrome-alloy steel file has twin 4" cutting edges. Among our most popular tools, these professional files help you get the job done quickly and correctly. What files do I need? Tip: Slotting Tune-o-matic style saddles Nut slotting files work great for metal saddles. Choose your file size as you would when slotting a nut: use the same gauge as the string, or a few thousandths larger. After filing to the desired depth, we suggest polishing the slot with an abrasive cord to remove file marks and burrs.Ensure your strings seat properly in the nut without buzzing - this tempered edge-cut file produces round-bottom slots for nuts and saddlesMade of chrome-alloy steel with twin 4" cutting edgesProfessional files that are a must for busy shops and hobbiest luthiers alikeGreat for metal saddles, too