Tusk Handlebar Risers 1 1/8" Bars, 30mm Height Tusk handlebar risers increase handlebar height by either 15mm (0.6 ) or 30mm (1.2 ).;Spacers are made from billet 6061 T-6 aluminum.;Tusk handlebar risers are complete with strong 12.9 tensile strength chromoly steel bolts.;Handlebar risers are available for both standard 7/8 bars and oversized 1 1/8 bars.