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 - M3 x 6 MM FH Plate Mounting Screws Compatible FirearmsGlock G17 Gen4 MOS, Glock G17 Gen5 MOS, Glock G17L Gen5 MOS, Glock G19 Gen4 MOS, Glock G19 Gen5 MOS, Glock G20 Gen5 MOS, Glock G21 Gen5 MOS, Glock G22 Gen5 MOS, Glock G23 Gen5 MOS, Glock G26 Gen5 MOS, Glock G34 Gen4 MOS, Glock G34 Gen5 MOS, Glock G35 Gen4 MOS, Glock G40 Gen4 MOS, Glock G41 Gen4 MOS, Glock G45 MOS, Glock G47 MOS Compatible OpticsHolosun 509T