Set your indicator into any desired position with unique 3-dimensional central locking mechanism. Fine adjustment. Features ul style"margin-top0px; padding-top 5px; padding-bottom 5px;" sealed system accepts all types of indicators - 3/8" stem lug back and dovetail turning knob to release all degrees of freedom joints fine adjustment magnet has 176 lbs (80 kg) holding power v-groove base allows mounting it on cylindrical surfaces