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)Range 54 - 89 mm (2 1/8 - 3 1/2 Inch) Handle 60 mm (2 3/8 Inch)Range 89 - 150 mm (3 1/2 - 6 Inch) Handle 82 mm (3 1/4 Inch)