New in the box, never used! I believe this only works on non-M cars. M3 and Z4M use a different tool if I recall correctly. I bought it for my E46 and never used it. The Koch Tools KT20297 is a 6-piece specialty automotive tool set designed to press out and press in the transversely mounted rear differential mounting bushing on BMW E46 3-Series (excluding M3) and E85 Z4 chassis vehicles without removing the subframe. Tool Details & UseFunction: Extracts and installs the single, large rear transverse differential bushing. On-Car Service: Works directly on the vehicle, which saves time by avoiding full subframe and driveline removal Vehicle Fit: Fits BMW E46 (non-M3) and E85 Z4 platforms.