Ruger Ruger-57 Optic Adapter Plate Aircraft Aluminum Matte Black. Also fits the TruGlo Tru-Tec? Micro TG8100B. The plate is precision CNC machined from 6061-T6 aircraft aluminum with a matte black hardcoat finish for strength and durability. Place the adapter plate onto slide and secure it using the two #6-32 screws provided. Tighten the screws firmly (30-50 in-lbs.) using a Torx T-15 wrench (not included). Install the optic onto the Adapter Plate by following the sight manufacturer's mounting specifications (sight not included). The Adapter Plate is 1.700" long x .975" wide and weighs .2 ounces. This Genuine Ruger Factory Accessory is made in specialized factories. Specifications for Ruger 90722 Ruger-57 Optic Adapter Plate Aircraft Aluminum Matte Black: Manufacturer: Ruger Red Dot Sights-Footprint: Docter Optic Cut: Ruger 57 Optics Ready Fabric/Material: Aircraft Aluminum Finish: Matte Black Package Contents: Ruger 90722 Ruger-57 Optic Adapter Plate Aircraft Aluminum Matte Black Ruger 90722 Ruger-57 Optic Adapter Plate Aircraft Aluminum Matte Black