These are the 4x4mm Set Screws
Steel construction
Ten 4x4mm Set Screws
Arrma indicates this will work with:
Bigrock: BLX (AR106017)
Fazon: BLX (AR106020)
Kraton: BLX, 8S BLX, ROLLER EXB, 8S ROLLEREXB (ARA110002Tx, ARA8608V5Tx, ARA106053, ARA5208)
Mojave: BLX, ROLLER EXB (ARA7604V2Tx, ARA7204)
Nero: BLX, BLXEDC (AR106009, AR106011)
Notorious: BLX (ARA8611V5Tx)
Outcast: 8S BLX (ARA5810)
Typhon: BLX (ARA8606V5)