Magnetic Base Indicator Holder This Magnetic Stand Indicator Holder will work with both Dial or Test Indicators with 5/32", 5/16" and 3/8" diameter stems or with 1/4" lug nut mount. Features include... Magnetic Base 175 lbs holding force Arm & Holder 2-1/8" Base Height 2" Base Width 2-1/4" Base Length 9" Overall Height