The Grove - Screw&Nut Pack (20 Sets) is used for the mounting of the Grove module. Part List: PM2.0xH5.0mm-Nylon-White Screw x 20 M2.0xH6.0mm-Nylon-White Nut x10 M2.0xH10.0mm-Nylon-White Nut x10 Dimension Screw 6.0 Nut 10.0 Nut