The Graph Tech TUSQ Martin Style 1 11/16" Slotted Nut is a great option to replace or upgrade the nut on Martin acoustic guitars with angled bottom, 1 11/16" wide nut slots. It has pre-cut string slots for a quick and easy installation. Their TUSQ material is efficient at transferring vibrations to your guitar and delivers a rich tone with crystal clear bell like high-end with big open lows and increased sustain, as a man-made material it is consistent from piece to piece with no hidden soft spots associated with bone. Graph Tech nuts are supplied slightly oversized to allow for final fit and shaping (material works easily with fine sandpaper).