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The 15-448-4 is a great quality and affordable Telescoping Hole Gage for any shop.
Contact points are hardened and ground precision tool steel.
Contact plungers automatically self center in all positions.
Constant spring tension for uniform feel.
Satin chrome finish.
Models with TiN coated plungers available.
Set supplied in vinyle pouch.
Once the plunger on 15-448-4 telescoping gage expands in hole to be measured, it should be locked in place and removed from the bore. The final hole size is obtained by measuring over contacts with a micrometer.