S.A.T. coil spring as seen in the Blink.

SOG Assisted Technology works through the balance of opposing high-tension coil springs. As one opens the blade the force to propel the knife open becomes greater than the closing force and the blade will open on its own. The end result propels the blade out once the operator has initiated the one-handed opening action.

S.A.T. works so well that right-handers can use their left hand equally well to open a folding knife (of course this works oppositely for lefties).

We warn you... this blade action is addictive! Play with it once, and you'll be opening it again and again!