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100kg Stong Switchable Magnetic Base Holder For Indicator Stand|holder shelf|holder appleholder ring - AliExpress
STARRETT Magnetic Base Only, Base Type Magnetic, Holding Power 150 lbf, Compatible Indicator Mounts 1/4 in - 6NAW6|659P - Grainger
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SPI - 117mm Long x 2" Wide x 55mm High Magnetic Indicator Base with On/Off Switch - 87242616 - MSC Industrial Supply
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