Benchmade 556 Mini-Griptilian Serrated Locking Knife - Black. This was my first Benchmade knife. The hex screws have come loose and now it falls out of my pocket all the time. I don't have an allen key that will tighten them, but at REI, the guy in the bike department told me he has had the same problem with his knife. He indicated a .5 allen key will do the trick. Another of the green-bibbed army told me that, "Benchmade is known for their blades, not their clips." Good to know. I have enjoyed the knife, but not this clip issue. I'll be seeking a hardware store to try to tighten the hex screws myself but am disappointed that Benchmade din't include such a tool or engineer the problem out of the tool before shipping.