This is the 29mm Hold Down Battery Set for the Traxxas Slash.        
This strap will allow for the use of up to 42mm tall battery packs.                                                                                                                   FEATURES: Black nylon construction                                                                                                                              INCLUDES: One Battery Hold Down                                                           One Retainer Hold Down                                                          One Battery Post                                                                One Foam Spacer                                                                 One Angled Body Clip                                                                                                                                  REQUIRES: Installation on the chassis

For standard retainer see PN TRA5827