Kreg Tool Company KKS2745 45" Clamp Trak Kit Can be mounted two ways: Surface Mount or Flush Mount Accepts all Kreg Bench Clamps Includes 27" Trak and 45" Trak Designed to fit benches 30"x48" and larger Compatible with 20"x44" Kreg Universal Bench Accept Automaxx Bench Clamps and standard Bench Clamps Each Trak measures 21/4" (57mm) wide by .695" (17mm) thick