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. Most of our plates feature a patented stainless steel T-Nut which provide an industry leading six to seven threads of engagement. Since all the mounting hardware is replaceable, if any mounting hardware is damaged it can be replaced without replacing the entire plate. SPECIFICATION: Material: Plates are made from 6061 aluminum. All mounting hardware is Stainless Steel Finish: Plates are MIL-SPEC Type III Hard Anodized - Black Replaceable 416 Stainless Steel T-Posts for maximum thread engagement INCLUDED: Qty 1 - Optic Plate Qty 3 - 6-48 x .200 FH Plate Mounting Screws Qty 3 - 4-40 x .345 FHB Vortex Defender CCW , Holosun 407K / 507K Optic Mounting Screws Qty 3 - 4-40 x .280 FHB Holosun EPS Optic Mounting Screws Qty 3 - 4-40 X .370 FHB CHPWS EDC / EDC-EN Optic Mounting Screws Qty 3 - Patented 416 Stainless Steel T-Nuts DRY-FITTING DISCLAIMER: At C&H Precision, our products are designed and manufactured to meet tight tolerances. Installation can be affected by variations in your plate, hardware, optic, and firearm tolerances. For safe installation and to prevent potential damage to any component, we advise dry-fitting all parts before a full installation. If any problems arise during this process, please reach out to our Customer Service via our contact portal.