This tool is specifically designed for holding the sprocket/chain in place when disassembling the VP44 Injection Pump and high pressure pump common rail fitted to BMW engines M47, M47T2, M47TU, M57, M57TU on BMW 318D, 320D (E46) 1988-2005 and 318TD, 320TD, 525D, 530D, 530, 535 (E60-E61) 2000-2006.