Features 1、Double action handles are rigidly attached to the contact plungers and are automatically self-centering. 2、Assist in quick checking of holes, slots and recess up to 6 inch deep. 3、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. 4、Constant spring tension delivers uniform contact pressure. 5、Super quality, high rigidness, good wear resistance, durable in use. Specification Features: Double action handles are rigidly attached to the contact plungers and are automatically self-centering. Assist in quick checking of holes, slots and 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 delivers uniform contact pressure. Super quality, high rigidness, good wear resistance, durable in use. Specification: Condition: Brand new Material: Tool steel Color: Shown as picture Measuring Range: 8-150mm Accuracy: 0.1 Quantity: 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) Package List