The "Southern style" sets round and stays round through all adjustments due to eccentric design and opposing pressures of the adjusting and locking mechanisms.
Color coded for easy identification of the Go and Nogo gage.
The aluminum body makes large gage rings light weight and easier to use.
The GSG "Southern Style" thread ring features the unique "Automatic Helical Adjustment". The Helix Path of the thread along the line of adjustment remains true and in alignment throughout the life of the gage.