The product consists of a clamping rod, a V-shaped clamp, a clamping head, and a clamping ring. The difference from the diagonal clamp is that the clamping ring is open, making it easy to remove and install the clamp; The functions of other parts are the same; Carving V-shaped grooves in three directions on the clamping head is beneficial for guiding the clamping of injection needles or electrodes, with a clamping range of 0.3mm-1.5mm.