Measurement Range: the measurement range of the telescoping gage is about 5/16" - 6" (8 mm to 150 mm), and the measurement range of the digital caliper is about 0 - 6'' (0 - 150 mm), which can provide you with precise measurement
Telescoping Gage Set: include A - 8 to 12.7 mm 5/16" to 1/2"; B - 12.7 to 19 mm 1/2" to 3/4"; C - 19 to 32 mm 3/4" to 1 1/4"; D- 32 to 54 mm 1-1/4" to 2-1/8"; E - 54 to 90 mm 2 - 1/8" to 3 - 1/2"; F-90 to 150 mm 3 - 1/2" to 6"; 6 sizes range, 0-6" caliper
How to Use: the inside micrometer can be expanded in a hole to be measured, locked in place and then removed to determine final hole size by the caliper measuring tool, it is very easy to get the measurement you want
Practical Design: the spring tension of telescopic bore gauge gives uniform contact pressure, can detect the inner diameter of a hole or groove; Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6'' deep
Reliable Material: the telescoping gage set is made of stainless steel material, which can prevents rust, a satin chrome plated surface that includes the case, contact points of hardened tool steel, telescoping spring, with a knurled locking knob and a knurled holding area