Carlson's is one of the premier names for quality replacement shotgun choke tubes. They use 17-4 PH stainless steel to make their products, which is one of the finest corrosion resistant materials available. Because Carlson's uses higher quality materials, their Flush Mount choke tubes stand up to lead free loads and heavy buffered shotshells, while out performing other competitive choke tube brands. Carlson's Choke Tubes are an excellent option to optimize shot patterns from your Browning Invector/Mossberg Accu-Choke shotgun to your sporting or hunting needs. Specifications and Features Flush mount choke tube Full constriction .700" Diameter Stainless steel Fits: FN SLP H&R Pardner Mossberg 500, 535, 930 and Maverick 88 Weatherby Orion, SA-08 and PA-08 Winchester 1200, 1300, 1400, 1500, and Ranger