Giant Contact Aero Clip-On Bar Clamp fits Giant Contact SLR Aero Bars (fitted to some Propel models as standard or available as a standalone upgrade part) and allows you to add Giant Connect SL Aero Extensions of your choice. FEATURES Fits Giant Contact SLR Aero Bars Two bolt clamp system Multi position stack height Fits Giant Connect SL Aero Extensions Not compatible with Propel Disc models