This pad is an extended version of the basic Estes port-a-pad. The same legs are used to attach to a much larger base, with a much larger blast deflector. The included rod mount supports both 3/16 and 1/4 rods. This pad has worked so well for my D and E rockets, that I have picked up another one and added a 1/8 and 3/16 rod base from another pad.