simply remove the top clamp, place the riser between the handlebar and bottom clamp, and install the replacement top clamp using included hardware. Raising the diameter tubular handlebar,provides a more upright, comfortable riding position. name: Handlebar riser Size: 28 MM/1 1/8 Inch Model: BAG101 applicable vehicle model list is for reference only Fitment: For 125-650 Japanese models with 1 1/8inch handlebars for WR250F 2015-2017 for WR250F 2007-2009 for WR400F 2016-2017 for WR400F 2007-2009 for WR426F 2016-2017 for WR426F 2007-2009 for WR450F 2016-2017 for WR450F 2007-2009 for YZ125 2007-2018 for YZ125X 2017 for YZ250 2007-2018 for YZ250F 2014-2018 for YZ250F 2006-2008 for YZ250FX 2015-2018 for YZ250X 2016-2018 for YZ400F 2014-2017 for YZ400F 2006-2008 for YZ426F 2014-2017 for YZ426F 2006-2008 for YZ450F 2014-2017 for YZ450F 2006-2008 for YZ450FX 2016-2017 for RM125 2006-2008 for RM250 2006-2008 for RMZ250 2007-2015 for RMZ450 2005-2017 for RMX450Z 2010-2017 Note: Not fit for R1250GS Color: Black Material: Metal Package Contents: 1 set x Handlebar riser Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.