Swivel Clamp & Holding Bar Set This set is designed to allow you to hold Mitutoyo Indicators with your Mitutoyo 570-Series Height Gages. You can hold a drop indicator with your height gage to measure groove depths or step heights. You can also hold a test indicator with this set and a height gage to measure flatness. Includes the following types of Indicator holders... 0.157" Stem or Post 3/8" Stem or Post Dovetail Combo Set includes... 2" Long Holding Rod Swivel Clamp