The KAK Industry Plan B Radial Brake is precision-machined from 17-4 stainless steel with a durable nitride finish for superior performance and corrosion resistance.KAK Industry Plan B Radial Brake1/2x28 thread pitch for 5.56 NATO/.223 calibers17-4 stainless steel construction with nitride finishOverall length: 1.850 inches weight: 2.5 ozMilled rear flats (13/16") for easy installationTiming not necessary for installationFully machined in-house at KAK IndustryDesigned for reliable muzzle control and recoil reduction this radial brake offers easy installation without the need for timing making it an excellent choice for AR-15 platform rifles and other firearms chambered in 5.56 NATO/.223 Remington.