Properly seated strings will get the best sound out of your guitar, and prevent bridge plate damage, too. Our Bridge Pin Hole Slotting Files match the bridge pin hole slots to the strings. Seating the strings properly in an acoustic bridge lets the guitar sound its best, helps prevent string breakage, makes string changing easier, and minimizes costly wear on the bridge plate. We're delighted to offer these unique new specialty files to help busy repair shops and luthiers do an easier, more professional job. Our Bridge Pin Hole Slotting Files are uniquely shaped to fit into the pin holes, smooth the saw cuts, and define the string "ramp" at the front of each hole. Specs: The 3"-long (76.20mm) cutting edge is rounded, so the string won't bind in the slot. Cutting width is .087" (2.2mm), which works for wound strings. Overall length is 5-7/8" (149.23mm). Made of chrome alloy steel. Our thanks to repairman Gene Imbody and our shop manager Todd Sams for their development work.