An archery nock is a grooved fitting on the back end of an arrow that receives the bowstring when drawing the bow. It’s essential to a successful release – without a nock, an arrow is going nowhere. Modern archers have an array of polycarbonate nocks to choose from, with small and large groove sizing to fit most bowstring widths. Press-fit nocks, which slide into the arrow shaft quickly and can be adjusted instantly, are the most popular, but choosing the right size is important. Pin nocks come in just one size, as they fit over a pin bushing that is fitted into the end of the arrow. They are similar to conventional nocks, which can be pressed into place over an arrow shaft that has a cone-shaped end. Overnocks slide over the arrow shaft and are most often used with carbon-fiber arrows. Archery nocks are very durable, but exposure to chemicals or solvent-based adhesives can warp them.