Motion Pro is dedicated to producing the most versatile, unique and durable products for professional and home use. Motion Pro tools are designed to be simple to use, yet durable enough to withstand the harshest conditions. One of their goals is to offer tools of convenience. Do it right the first time with Motion Pro Tools. Versatile enough to be used on cam chains or drive chains. Will break chains from #35 to #530. Kit includes 3 pin sizes to fit most chains (2 mm, 3 mm, 4 mm). Investment-cast, hardened body and redesigned body bolt. Recommended for light to medium-duty use. For riveting hollow nose master links. Kit includes press plates. Note: For chain #520 and up, it is recommended to grind the rivet head.