Harshman Gauges & Engineering Co. Offers Handles & Collets. Harshman Gauges & Engineering Co. Supplies Thread Ring, Plug Gauges, Thread Plug Gauges Thread Ring Gauges, etc. The Handles & Collets are engraved and attractively anodized. They have light weight handles & collects are available on request. Smooth & firm clamping of pins in Handles & Collects makes measurements easy.
