Allows removal and installation of studs without damaging threads. Allows tightening and torque without compromising thread integrity. Industrial quality steel construction with black oxide finish for longer tool lifeComes with durable, protective carrying case to keep pieces from getting lostComes with 6mm x 1.0, 8mm x 1.25, 10mm x 1.25, and 10mm x 1.50 stud installers