This tool is the fastest, surest way to perfectly square nuts and saddles in seconds; Allows for fine adjustment in the height of nuts or saddles. Aluminum and Steel construction; Solves the tone trouble caused by poorly-shaped (and thus poorly-fitted) nuts and saddles. Wheels are very hardened steel bearings. The Nut and Saddle Sander holds the nut or saddle perfectly vertical while you roll it over sandpaper on a flat . Adjustment screws set the amount you want to remove, and in moments the piece is squared up and truly flat. Adjustable Height sander for bone, plastic and composite nuts and saddles. This tool is typically used after shaping a saddle or nut to its final shape. Size: . 16.5x6.3x4.5cm/6.5x2.48x1.77in Colour:Silver Material:Metal Package Contents: 1 x Guitar Nut Sander Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.