These steel bars have a 1-1/4" diameter and a gloss black finish They have a 1" center diameter so they can be mounted with 1" risers All bars have been drilled for internal wiring and notched for Throttle-by-Wire models They have a 3-1/2" on center knurling and a 5-1/2" clamping width to accommodate one-piece top riser clamps These bars will not work with hydraulic clutches