

Automatic self-centering handle. Plungers telescope within each other, providing a positive seat in all positions. Constant spring tension gives uniform contact pressure. Plungers are easily locked at any desired setting. Contact ends are hardened and ground to a radius to provide proper clearance.
4-piece set.
Includes 4 sizes No.'s 579A, B, C, D (from 5/16" to 2-1/8") and case.