Product Feature: The threads are cut properly and fit rods securely. The compact storage box features marked cavities for each caliber. Sizes to fit almost all firearm: .17 .22/.223/5.56MM .243 .250 .270 .30/7.62MM .325 .338 .357/9MM .40 .45 20GA 12GA Specification: Core Material: Steel wire Core End: Looped 12 Gauge & 20 Gauge brushes are 5/16-27 threaded. 17 Caliber brush is 5-40 threaded. Other brushes are standard 8x32 threaded. Case Size: 9.2x3.7 inch Note: .22 cal = .223 cal = 5.56MM .30 cal = 7.62MM .357 cal = 9MM Package Includes: 13x Bore brushes 1x Convenient storage box.
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