The Starrett 831 Small Hole Gage Set contains a gaging surface that is a half-ball with a flat bottom. This permits use in even the most shallow holes, slots, and recesses. SET of 4: Nos. 831A/B/C/D,...
The Starrett 830 Small Hole Gage Set includes all gages that are only 2" (50mm) long, making them convenient to use in close quarters. SET of 5: One each of Nos. 830A/B/C/D/E, in Case quarters.
