The C&H Precision plates are designed, manufactured and shipped from our small family owned business in Coastal Georgia. Each plate is precision machined to the tightest tolerances on HAAS CNC machines and each plate goes through multiple quality checks before shipping to our customers. SPECIFICATION: Material: Plates are made from Mild Grade steel. All mounting hardware is Stainless Steel Finish: Plates are Electro Deposition Painted - Black INCLUDED: Qty 1 - Optic Plate Qty 3 - M4 x 8 MM M3H Plate Mounting Screws Compatible FirearmsHK 2020 VP9, HK VP9, HK VP9 Match, HK VP9 Tactical OR, HK VP9L OR, HKVP9SK Compatible OpticsHolosun 509 T