Each kit includes 3 pin sizes to fit most chains (2mm, 3mm, 4mm). Investment-cast, hardened body and redesigned body bolt. Recommended for light to medium-duty use. For riveting hollow nose master links only. For riveting solid nose master links such as those found on EK and Regina chains, use 08-0135 Jumbo Chain tool in conjunction with 08-0142 Quad-Stake Rivet Kit.