This is a replacement pack of eight Arrma BLX, BLX 4x4, and Roller 4x10mm Button Head Screws. 
 
Features:
Precision manufactured for consistent fit and easy set-up adjustments
These screws feature a 2.5mm hex on one end and a 2.0mm hex on the opposite end allowing fit and removal from either end
Supplied in packs of 8 so you always have a spare
Includes:
(8) Double Socket Button Head Screw (Size: M4x10mm)