Index finger joint protrudes slightly and is held firmly in place by thumb. Similar to keiko-ken zuki , but using second finger. Thumb and index finger press firmly against middle finger to hold it in place. Thumb bent and pressed against palm. First knuckles straighted and fingers curled inwards to touch edge of plam.
Strike is made with middle bone of the fingers.
Thumb is used to strike. The strike is with sokuto , the outside edge of the foot. Delivered from inside to outside of body. Also called soto mikazuki geri . Also called uchi mikazuki geri .