Using rotary switch, can be adjusted freely. Tempering treatment, strong hardness. Measuring thread and external thread pitch. Measuring gauge To 60 degree thread (60 degree metric), 55 degree thread (55 degree inch). Material: Carbon Steel. Color: as picture shows. Quantity: 1 pc. Type: 60 degree metric, 55 degree inch, 60 degree metric+55 degree inch. 60 degree metric Measuring Range: 0.4/0.45/0.5/0.6/0.75/0.8/1/1.25/1.5/1.75/2/2.5/3/3.5/4/4.5/5/5.5/6mm. 55 degree inch Measuring Range: 4/4.5/5/6/7/8/9/10/11/12/14/16/18/19/20/22/24/28/32/48. Package included: 1 set x thread pitch gauge. Note: degree equal to '. Please allow 1-5mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.