The Grove - Rivet Pack (30 PCS) is used for the mounting of the Grove module. For more detail, please refer to the datasheet in the DOCUMENTS Tab. Part List Rivet: Black-Plastic-R2048 x10 Rivet: Black-Plastic-R2056 x10 Rivet: Black-Plastic-R2064 x10 Dimension Diagram (Unit mm) The figure below shows the dimension of the R2064. The other Rivets have the same dimensions as the ones, only the length is different. Assembly example These rivets are also plastic and they are more convenient to use than screw and nuts. These are only suitable with Grove modules with a flat base at the back. Therefore they they are not suitable for Groves with the Grove port at the back (panel mount).