Perfectly square nuts and saddles in seconds!
For solid contact and good tone, the bottom of a nut or saddle must be squared up. This "vise on wheels" is the fastest, surest way to do this.
Solves the tone trouble caused by poor fit
Hand-sanding a nut or saddle, it's hard not to tilt it one direction or the other. The result is a poor fit in the slot—always a tone problem, but especially with undersaddle pickups.