The KF4, though now retired, was introduced by Leatherman in 2001 with the launching the Juice line. It’s been released in “solar” yellow as well as “storm” grey. You’ll also see my customized beater in a few picks.
As far as the tools go, the KF4 tool list reads like a fully equipped large multi-tool, with the notable exceptions of scissors and can/bottle openers. Everything on this tool solidly snaps open with back springs like a slip joint pocketknife.
Rather than add to the existing Juice Series Review already posted here I decided that the KF4 was a standout enough tool to warrant it’s own article. Besides, as a discontinued model (the only discontinued Juice model) it really is in a class of it’s own.