Aluminum Base, manufactured by Chinese Permanent Mold Casting Method ( also named Gravity Casting).
Material: A356 T6.
Good CASTING tolerance per ISO8062 CT7.
Permanent Mold Casting and low pressure casting, Casting Quality only used to make aluminum castings.
Permanent Mold Casting can get a better surface and dimensions than sand castings; Low Pressure Casting can get a stably structure which are suitable to the endure pressure parts.