Features:Double action handles are rigidly attached to the contact plungers and are automatically self-centering.Assist in quick checking of holes, slotsand recess up to 6 inch deep.The ends of both contact are head treated steel and precision ground to a radius allowing proper clearance on the smallest hole the gauge will enter.Constant spring tension deliversuniform contact pressure.Super quality, high rigidness, good wear resistance, durable in use.Specification:Condition: Brand newMaterial: Tool steelColor: Shown as pictureMeasuring Range: 8-150mmAccuracy: 0.1Quantity: 6Pcs/Set (ABCDEF)Scope of Application: Telescopic spring piston in the hole (or groove), can conduct inner diameter detection, used with micrometer or caliper, with knurled locking device.Package List:1 Set Telescopic Gauge (6pcs)