Help you to find your perfect handlebar position: move them up and down, forward and backward, 2D.GT handlebar risers give you still unseen adjustability and styling. For top yokes with 10.5 mm holes. Forward and backward adjustable in 3.6 mm steps. Maximum range forward and backward 25 mm (depends on height adjustment and bike tank). Adjustable up and down in 5 mm steps with spacers (maximum number of spacers is 5, depending on the bike). For 1-1/8 handlebars (spacers available separately for 7/8″ handlebars).