Milwaukee Twins Stock Style 1 1/2 Riser Set Milwaukee Twins Stock Style Riser Set is a complete set at an affordable price. Risers fit a 1 bar with a 3 1/2 center-to-center riser spacing making them great option for a custom build or just to refresh your old risers. Features: 1-1/2 rise 1 clamping area 3-1/2 center-to-center riser spacing Includes 1-piece top clamp