Material: Chrome plated, not easy to rust. Application: This propeller drill jig is suitable for DLE30/35RA/40/50/55/55RA/60/61, MLD35/70, EME35/55/60, DA50/60, DLA32/56/58/64, EVO54/58, 3W50/55, MVVS58, TR-50HP, JC51 and GP-61 gasoline engines....