Sorby Steb Drive, 1/2 in. is designed to fit seamlessly into the jaws of a chuck, eliminating the need to remove the chuck each time you want to use a drive center. This innovative tool fits neatly in most four-jaw scroll type chucks and features a spring-loaded center point combined with a ring of razor-sharp teeth. By adjusting the tailstock, you can vary the degree of "bite" while keeping the center point firmly in place, ing enhanced control and safety. For novice turners, a light setting prevents kickback by stopping the workpiece if a dig-in occurs. In production turning, the teeth can be backed off without removing the workpiece, allowing for quick stops and checks, as well as easy exchange of finished pieces and blanks. The size refers to the drive face diameter, and this model comes in diameters of 1/2", 7/8", and 1-1/4". Made by Robert Sorby in England, this tool is a reliable choice for woodturning enthusiasts. Model Number: LSTBCHUCK13