AS A ROPE BLOCK: Thread two of the Rope Clamps on the line using the longer channel (top channel) so that the flat ends are facing each other. Slightly lift the handle and push down gently. It doesn't take much pressure to secure the clamp. Once loose, you can move the Clamp up and down the line. If you're using a 6" leash, set the clamp about 4 feet from the anchor points (tree, post, or pole) to help prevent your dog from wrapping itself around it.
AS A ROPE CLAMP: If the anchor point, such as a trunk of a tree, is too wide to accomodate the size strap you have, the Toughman rope clamp can be used to secure the rope around the anchor point. First, thread the end of the rope through the longer channel of the clamp. Once you wrap the rope around the anchor point, secure it by threading it into the shorter channel and clamping the lever down in the shut position. Don't tighten the line using the clamp. Tree bark is very abrasive and will cause premature wear on the rope. Go to the other end and use the Nite Ize ratchet to tighten the line.