2" Pivoting Anti-Vibe Bar Risers with a 7/8" stem clamp, can accept 7/8" OR 1 1/8" Handlebar- 2 Color Options2" of Rise (51mm) 7 8" Stem clamp (Bottom Post) (22mm) Can accept a 7 8" OR 1 1 8" Handlebar (22mm or 28mm) with the use of removeable reducers at the top. Lifetime Warranty Made in the USA Pivots forward or backward depending on rider preference Designed to reduce bar vibration and decrease hand tingling numbness on longer rides. Always check and confirm that your machine has adequate cable and brake line length before installing handlebar risers!