Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6 inch deep The ends of both contact are head treated stainless steel and precision ground to a radius to allow proper clearance on the smallest hole the gage will enter Constant spring tension gives uniform contact pressure Handles are rigidly attached to the contact plungers and are automatically self-centering Nickel-plated finished Material: Hardened steel Color: Silver Size: Measuring range 8-150mm Package Included: 1 Set x 6 pcs Precision Telescoping Gage 8-150mm Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.