Kaw Valley Precision MACH Thread Adapter Threads per Inch Black Small. The thread adapters can also be used as Direct thread adapters for various suppressors on the market. The MACH linear comp system utilizes a 1-1/8x28TPI OD thread that is common in many suppressors. Specifications for Kaw Valley Precision MACH Thread Adapter: Manufacturer: Kaw Valley Precision Color: Black Finish: Hard Coat Anodized Fabric/Material: 6061-T651 aluminum Weight: 0.535 - 0.585 oz Condition: New Outer Diameter: 1.285 in Length: 0.8 in Package Contents: Kaw Valley Precision MACH Thread Adapter Kaw Valley Precision KVP-MACH-TA-1228: MACH Thread Adapter 1/2x28 Threads per Inch Black Small