Spyderco Squeak

The Squeak's blade is held in the open position when cutting by a notched-joint at the knife's pivot. When closing the blade, the notch generates resistance functionally similar to traditional slip-joint penknife and performs the additional function of smoothing the motion of the blade opening. Increasing control and comfort Spyderco designers add a deep finger choil, naturally jogging the index finger into a position on the underside of the blade directly below the thumb. Positioning the index finger in this choil blocks the blade from accidental closing when cutting and provides a grip position that allows the user to choke-up closer to the cutting edge for greater dexterity.