The yoke cap mount base replaces the yoke cap or nut. Mount base gives you a 1" (25mm) ball fitting - British engineered - made from High Tensile Anodised Aluminium solid billet. Supplied: 1 x Yoke 40 cap mount base 1 x short arm 1 x Garmin 17mm adapter To Fit Size 28mm Thread Pitch 1.0mm Socket Size 35mm Colour Black Height 50mm Fitting - tighten to manufactures torque setting.
eBay