Absolute sealed hydraulic system.
Knob turning creates tension and high pressure on the joints to hold the rods absolutely rigid.
Multi-nimble joint for instant fix at any desired position.
Fine adjustment.
Fits dovetail and 3/8" stem indicators.
Super power pull 130 lbs.
Base dimension: 2"(Width) x 2-1/2"(Depth).
Universal Hydraulic Magnetic Base