With central locking system, fine adjustment on the fastening, length of arms + fastening 178 mm. The shank of the ball pin can be fastened into a spindle. Base: ball pin with shank ø 8 mm. Arms: 56 + 51 mm. Fastening: with sensitive adjustment mechanism, 3/8", ø 6 mm, ø 8 mm, dovetail 8 mm.