Kaw Valley Precision AR-15 Gas Block Dimpling Jig .625 Black Small. The 6 different laser-marked spacing sets allow for a variety of gas block applications. The jig will fit perfectly in any bench vise to allow easy dimpling. Spacing is to the center of the 5/32 drill guide holes: .400 .420 .450 .460 .470 and .500. Machined from US Steel and QPQ Heat Treated. Comes with: (1) Alignment set screw (1) Non-marring set screw NOT Included: 5/32" Drill Bit/Spot Drill needed for cutting the dimples. Specifications for Kaw Valley Precision AR-15 Gas Block Dimpling Jig: Manufacturer: Kaw Valley Precision Condition: New Finish: QPQ Gun Type: Rifle Fabric/Material: Steel Gun Model: AR-15 Color: Black Package Contents: Kaw Valley Precision AR-15 Gas Block Dimpling Jig What firearm models does the manufacturer say Kaw Valley Precision AR-15 Gas Block Dimpling Jig is compatible with? The manufacturer says that Kaw Valley Precision AR-15 Gas Block Dimpling Jig is compatible with AR-15Kaw Valley Precision KVP-Dimpling-Jig-.625: AR-15 Gas Block Dimpling Jig .625 Black Small