Swissmar Shucker Paddy Universal Oyster Knife
How to use: Holding the Shucker Paddy palm down, you firmly wriggle the point of its blade about 2 millimetres into the oyster's hinge. Then twist your wrist clockwise (counter-clockwise if you're left-handed). As the knife's tip rotates, the oyster pops open. The world is your oyster.
Measurements: 20cm / 8" x 3cm / 1.25"