Set of mills for repairing injector seatings in diesel engines. Honing the seatings when replacing or reinstalling old injectors increases the joint tightness thus combustion efficiency. Contains: 15 mm diameter (flat version) universal application, 17 mm diameter (flat version) Delphi/Bosch injectors (BMW, PSA, RENAULT, FORD), 19 mm diameter (flat version) Bosch injectors (Mercedes CRD), 19 mm diameter (oblique version) Fiat, Iveco. Application arbor. Material: SKD11. Hardness: 58 – 60 HRC. Comes in a plastic case.