Features:
Made of tool steel, durable and reliable.
The double-acting rigid handle has a self-centering function, which quickly inspects holes, slots and grooves up to 6 inches deep.
The ends of made of stainless steel and precisely ground to a radius to achieve the proper clearance on the smallest hole when the gauge is entering.

A constant spring tension provides a uniform contact pressure.
The rigid handle is fixed on the contact plunger and automatically centered with nickel plating finished product.

Usage:
Under a uniform spring tension, the gage's plunger extends from the center to the diameter of the hole or the width of the groove being measured, then is locked in place by the knurled knob, and the hole size is found by measuring the hole size at the two contact points micrometer or caliper.

Specifications:
Material: tool steel
Color: silver
Range:about 8-150mm

Package included:
6pcs x telescoping gage
Made of high-quality materials, sturdy and durable, with good stability and flexibility.