• Self-centering and satin chrome finish.
• Constant spring force on to the measuring surface. Locked in position by knurled lockscrew.

Spring-loaded plunger expands within the bore (or groove), allowing determination of the internal diameter (or groove width). Has a knurled clamp. Supplied in a fitted pouch. 6 Pieces: .313-.5", .5-.75", .75-1.25", 1.25-2.125", 2.125-3.5", 3.5-6".