Starrett DC902 S579GZ Telescopic Gauge Set 4 Piece 8-54mm

Handles are rigidly attached to the contact plungers and are automatically self-centering. Constant spring tension provides uniform contact pressure and both plungers are easily locked at any desired setting.

Range 8 - 13 mm (5/16 - 1/2 Inch) Handle 60 mm (2 3/8 Inch)
Range 13 - 19 mm (1/2 - 3/4 Inch) Handle 60 mm (2 3/8 Inch)
Range 19 - 32 mm (3/4 - 1 1/4 Inch) Handle 60 mm (2 3/8 Inch)
Range 32 - 54 mm (1 1/4 - 2 1/8 Inch) Handle 60 mm (2 3/8 Inch)