Kaw Valley Precision MACH 3-Lug Mount 9mm Caliber Black Small. By utilizing 1-1/8x28 TPI threads the MACH 3-Lug Mount will fit many common silencer models such as the SilencerCo Octane and Omega K series Rugged Obsidian and Griffin handgun silencers. The external components are machined from US 4140 Steel and Black Nitride QPQ finished to provide excellent wear properties for a long service life. The MACH system utilizes a 1-1/4" hexagonal wrench flats for easy installation with a standard open end or adjustable wrench. Specifications for Kaw Valley Precision MACH 3-Lug Mount: Manufacturer: Kaw Valley Precision Color: Black Finish: Nitride Fabric/Material: 4140 Steel Features of Kaw Valley Precision MACH 3-Lug Mount Added Length: .54" Package Contents: Kaw Valley Precision MACH 3-Lug Mount Kaw Valley Precision KVP-MACH-3LUG-MT: MACH 3-Lug Mount 9mm Caliber Black Small