The PVC peg features a strong yet lightweight 4130 alloy steel core inserted into a fast-grinding, injection molded, plastic polymer sleeve. Included with each peg is a hardened steel 14mm/10mm reduction sleeve for use with a 3/8″ / 10mm axles. Unlike smaller diameter pegs that only accept some 17mm sockets, this peg accepts 17mm and 19mm sockets for installation/removal.