The ADI combination wrench, #10014, is made from machined steel, hardened, and has a black finish with the ADI logo and sizes laser engraved. You wont have to worry about the wrench ends spreading open or changing size after just one use compared to other aluminum wrenches. The ADI combination wrench can be used to adjust 5.5-6mm turnbuckles. The 5.5mm end can also be used with a standard M3 nut.