SPI 14-197-8 Telescoping Hole Gage, TiN Coated , 2-1/8" - 3-1/2"

Plunger on gage expands in hole to be measured, locks in place and remove gage from hole. Final hole size is obtained by measuring over contacts with a micrometer

Features:

• Contact points are of hardened and ground precision tool steel.
• Contact plungers automatically self center in all positions.
• Constant spring tension for uniform feel.