Description Specification:Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6 deepThe 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 enterConstant spring tension gives uniform contact pressureHandles are rigidly attached to the contact plungers and are automatically self-centeringNickel-plated finishedUsageUnder uniform spring tension, the plunger of the gage expand from the center to the diameter of the hole or width of slot being measured and then locked in place by a knurled knob,the hole size is found by measuring over the two contact point with a micrometer or caer.Material: Hardened tool steelColour: SilverProduct includes:1 Set 6 pcs Precision Telescoping Gage 8-150mm