The pro-level quality 31.8 mm clamp diameter stem weighs less than many carbon stems;4-bolt dual band clamp securely holds handlebar;Uses high-quality M5 corrosion-resistant faceplate bolts with 5.2 Nm torque spec;Integrate accessories with the included Blendr Pro base and Blendr XXX accessory mounts;Mounts intended for use with Ion and Trip, Garmin, GoPro and SRM accessories;Approved for carbon bars and steerer tubes;Safe installation requires a 5 mm spacer above and below the stem;Included Blendr accessories - Pro Mono Base, Trip Computer mount and High Ion Light mount;