NO KNIFE INCLUDED WITH RIPPLE. Knife in picture is for example product display only. One Orange .08" kydex ripple that attaches to hole in knife blade and allows the blade to open automatically by catching on the back of pocket. Only works with tip up carry knives. Comes with a screw and 1 large, 1 small screw post. Depending on the thickness of the blade, use which ever one works better to hold Ripple tight. These work on Spyderco Rescue, Delicate, Endura, Paramilitary 2 (when set for tip up carry), Boker Nano, most Spyderco that are tip up carry and many other brands that have a blade that is 1/8" thick plus or minus a bit is ok just need to utilize the different size post to keep tight.