Gloss black electroplated. O/S (Over Sized) with insert to fit 1" and 1 1/4" diameter tubing. These CNC T-6 machined aluminum speed clamps are used to mount speedo or tacho meters. Designed to clamp to the uprights, or risers, of T-Bar style handlebars. Easy to install with the hinged style mount. Comes with a 5/16-18 threaded bolt hole for which an allen cap bolt is included.