The Wehrs heavy duty modular steel clamp on metric caliper bracket is designed for aggressive brake packages and feature a caliper support flat and tab for better braking. Axle clamp is 3/4" wide and the caliper plate is 3/8" thick for superior strength. Drill size is 21/64" and tap must be 3/8"-24. Must be ordered for the side needed so the caliper support tab works correctly. This is the Left Rear bracket. For 3" axle tube.