6Pcs/Set 8-150mm Telescopic Gauge Set Micrometer Measurement Bore Engineers Kit

brand new and high quality
Material: Hardened tool steel
Color: as shown in pic
Usage：
Under 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 caliper.
　

Features:
Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6" deep
The ends of both contact are for 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
Quantity:6 Pcs/Set

Package Including:
6 Pcs/Set Precision Telescoping Gage 8-150mm