This GPM set supplies stainless steel king pin screws specified for HPI Racing SAVAGE XL FLUX front C hub and rear knuckle mounting. The components are precision produced to provide a consistent seating diameter and reduce mechanical play. Threading is M4, the drive accepts a 2.5mm hex key, and the no-thread shaft measures 3.98mm to align with standard housings. Total length is 21mm, chosen to limit clearance and support predictable steering geometry under load.