Fowler Flex Arm Mag Base with Dial Indicator Combo 52-641-300-0 Flex-Arm Mag Base features: 85 lb. pull Holds rigidly in any position desired. V-base for placing on round surfaces. On-Off lever release magnet. Indicator features: 1" travel AGD group 2 2-1/4" dial diameter Reading: .001" Continuous reading: 0-100 Revolution counter Tolerance indicators