Adj. wrench: 1) Material: C1045 Mild carbon steel, 40Cr alloy steel, Cr-V steel 2) Surface finishin Adj. wrench:1) Material: C1045 Mild carbon steel, 40Cr alloy steel, Cr-V steel2) Surface finishing: chrome plated, black oxide, phosphorized, matte finished, nickel iron finished3) Handle: various kinds of comfortable grip made of PP, PVC, and TPR at one color or two tone colors combined4) Size: 4/ ...