Used to remove diesel pre-chamber locking ring on Mercedes-Benz engines from 1989. Suitable for engines with the following codes: 601, 602, 602.91, 603, 605, 604, 606, 661, 662. Material: chrome vanadium steel, black phosphate finish. Size: 58 teeth, 1.5 x 28mm. Square drive: 1/2". Length: 60mm.