The GPM SUS2.5X4 is a precision engineered set of SUS304 stainless steel cap head socket screws, size M2.5x40mm, intended for accurate assembly and durable fastening in RC projects. These stainless fasteners offer consistent thread engagement and corrosion resistance, supporting reliable joints during service, tuning and upgrade work. Their uniform head geometry and material grade make them suitable as a durable upgrade over standard plated hardware.