Master Every Layout With The Professional Metal Rapid Rafter Expansion Kit. This kit transforms your metal Rapid Rafter into a modular powerhouse for everything from trim to massive timber. Includes three interchangeable bases for a perfect footprint on any board. The 3 in. base handles narrow framing and trim. The 4 in. base is the workhorse for 4x material. The 6 in. base is essential for 6x6 posts and large beams. High-strength construction ensures dead-accurate precision. Includes a hex wrench and bonus hardware so you never stall if a screw goes missing. Compatibility. Fits metal Rapid Rafter models Only. Not for plastic versions. Tool sold separately. Includes 3 bases, hex wrench, and replacement screws. Get the job done right with professional grade results.