6pcs 5/16inch - 6inch Telescoping Gauges Internal Gauge Hole Gauges

Description :
6pcs 5/16"-6" Telescoping Gauges Internal Gauge Hole Gauges For Quick Inside Measurements Of Holes
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 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.
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.
Specification :

Letter Code	Range	Overall Length	Depth
A	5/16" - 1/2" (8 mm to 12.7mm)	4-3/8"	4"
B	1/2"- 3/4" (12.7mm to 19mm)	4-3/8"	4"
C	3/4" - 1-1/4" (19mm to 32mm)	4-3/8"	4"
D	1-1/4" - 2-1/8" (32mm to 54mm)	5-7/8"	5"
E	2-1/8" - 3-1/2" (54mm to 90mm)	5-7/8"	5"
F	3-1/2" - 6" (90mm to 150mm)	5-7/8"	5"

Package included :
6 x Telescoping Gauges Internal Gauge Hole Gauges Set
Details pictures :