Range: 5/16" - 6" (8mm to 150mm), 6 pc set includes: 1 gage: 5/16 - 1/2" range x 4.20" overall 1 gage: 1/2 - 3/4" range x 4.40" overall 1 gage: 3/4 - 1-1/4" range x 4.40" overall 1 gage: 1-1/4 - 2-1/8" range x 5.85" overall 1 gage: 2-1/8 - 3-1/2" range x 5.85" overall 1 gage: 3-1/2 - 6" range x 5.85" overall Spring with locking knurled spiral The gauge extends in the hole to be measured (lock it in place, then use a micrometer or caliper to remove it to determine the final hole size). Constant spring tension makes the hand feel even The contact point is hardened tool steel and finely ground within the final measuring radius Get the exact size of holes, slots, holes or grooves Rigid handle and double-action design (self-centering), which can quickly check internal measurement results with vinyl case

• 【Fine Workmanship】The contact point of this machinist tool is hardened tool steel and is fine ground within the final measuring radius
• 【Smooth and constant spring tension】 The spring is equipped with a knurled locking knob and a knurled fixing area.

Specifications

Common questions