2 x Black Alloy Riser / Spacers compatible with, for example, Hongfu Products Carbon Aero Bars (Product Code - HB019 and HB029) and other quality bars such as Planet X Selcof, ADR Ultimate, PDQ - (Not compatible with the older Planet X Stealth Bars)

Risers can be stacked up to a maximum recommended height of 60mm using 2 x 100m M5 Bolts 

Note the width between the 2 bolt holes inside the spacer is 25mm c/c

Note: Sold as a pair ie 2 x 20mm spacers ONLY - fitting screws not included