Sorry but I can't provide a picture. Reel clamps are usually found on salt water conventional or bait casting reels. They are metal, plastic, nylon or graphite and are curved to fit around the bottom of of the reel seat. They are attached to the reel by two bolts that go through two slots in the bottom of the reel. When they are tightened down they lock the reel to the real seat. Even if the locking rings on the reel seat should fail, the reel remains locked to the rod. Google "reel clamps" and several examples will pop up. The reel clamp takes the pressure off of the locking rings on the reel seat and prevents the reel from twisting in the reel seat.