Main Function: Helps to quickly check holes, slots and recesses up to 6 inches deep.
Scope of Application: The telescopic spring plunger in the bore (or ), can do the inner diameter detection, used with micrometer or caliper, with knurled locking device.
Easy to Use: Double-action grips are firmly attached to the plungers and automatically self-center.
Material: 6 piece telescopic gauge set made of steel, high rigidity, good wear resistance, in use.
Heavy Duty: The ends of both contacts are head treated steel and ground to a radius that allows adequate clearance for the smallest hole the gauge enters. Constant spring tension ensures even pressure.