Mitutoyo Telescoping Gage Set Spring-loaded plunger expands within the bore (or groove), allowing determination of the internal diameter (or groove width). With knurled clamp. Supplied in a fitted case pouch. Included in Set: 8 - 12.7mm 12.7 - 19mm 19 - 32mm 32 - 54mm 54 - 90mm 90 - 150mm