These are the length-of-pull spacers for the X-Ray and Bravo Chassis but in a heavy steel version for those shooters looking to add some weight to their rifle. They can be used with the Whiskey-3 also, sandwiched between the buttpad and the buttpad mount plate. Each spacer is 3/8" thick. The starting LOP for the X-ray Chassis is 12.8" approx for the Rem 700 version and 12.9" approx for the T3 version. FeaturesFits: X-ray & Bravo chassis, Whiskey-3Weight: .66 lbsMaterial: Steel with nitride finish