Kershaw 'Speedsafe' assisted opening knives such as Kershaw Chive Knife have a blade which is held closed until it has been manually opened past the thirty degree position. Once the blade has been partially opened, it then engages a spring to rapidly open the blade.

Kershaw Black Colt II K1045A Lock Knife Kershaw Knives £49.99	Kershaw Black Horse II K1060A Lock Knife Kershaw Knives £54.99
Kershaw Chive Knife Kershaw Assisted Opening Knives K1600BR £39.99