Xtrig Solid Bar Mount Kit M12 (Optional Sizes) Xtrig Clamp Fitment
Product Info:

To suit M12 XTrig Triple Clamps Only.
Available in Two Sizes 22.2mm or 28.4mm
The Fix System is rigidly mounted to the triple clamp. It is available for 28.4mm or 22mm handlebars.
The Fix System allows the handlebar to be mounted in 18 different positions, including the positions offered by the PHDS.