HK MOTO- 1'' SPIKE CUSTOM 4" RISE BILLET HANDLEBAR RISERS FIT FOR HARLEY-DAVIDSON CHOPPER BLACK Hole Diameter: 1" Custom Spike style with hidden clamp bolts. Eliminate the handlebar top clamp with precision machined billet risers. Mount with coarse thread riser bolts. 4" Rise , 7" overall height. Fits all Harley-Davidson models and any custom application. Mounting bolts are included.