Carbon Arrow Nocks and Inserts by Allen are sized to fit most carbon arrows. Installs easily with a small amount of Nock glue and align to your desired position. Inserts fit popular arrows like Allen Pro, Eastman Outdoors Carbon Express, Wolverine, Terminator, Terminator Lite, PSE Carbon Force, Arrow Dynamic, Plainsman, Black Hawk Vapor, and Carbon Tech arrow shafts. Includes 6 aluminum inserts and 6 nocks.