These telescopic gauges are used with an outside micrometer for measuring inside diameter of bores and are extra long for measuring deep and shallow holes, slots and similar workpieces. Stainless steel materials, not easy to deform or break, support long time using. Features -Color:Silver -Material:Stainless steel -Size:15.20X13.30X1.00cm/5.97X5.23X0.39in -Size:13.80X9.20X1.00cm/5.42X3.62X0.39in -Size:13.80X4.90X1.00cm/5.42X1.93X0.39in -Size:11.40X3.00X0.70cm/4.48X1.18X0.28in -Size:11.40X1.90X0.70cm/4.48X0.75X0.28in -Size:11.60X1.30X0.60cm/4.56X0.51X0.24in -Made of stainless steel materials, the telescopic gauge set will not easy to deform or break, can be used for long time. -Use the gauge to expand in the hole you want to measure, lock, and then take it down, and measure with micrometer or caliper to determine the hole size. -High precision measuring tools, can be used in the industry, machinery, manufacturing and other fields. -Durable and easy to use, the telescoping gauges are suitable for both DIY enthusiasts and professionals. -Portable to take, with different sizes, the telescoping gauges satisfy your demands better.Package list: 1 x telescoping gauge(5/16'' To 1/2'') 1 x telescoping gauge(1/2 To 3/4) 1 x telescoping gauge(3/4" To 1-1/4") 1 x telescoping gauge(1-1/4 To 2-1/8'') 1 x telescoping gauge(2-1/8" To 3-1/2'') 1 x telescoping gauge(3-1/2'' To 6'')