Reference: Wrenches (open)
Materials: Beryllium copper Cu-Be
Hardness: 283-365 Brinell.
Protection: Tools made of Cu-Be alloy can be used in all groups (I, IIA, IIB, IIC) in a safe way, with the only exception of acetylene, with which copper might react and create highly explosive acetylite gases.
Documentation Wrenches (open) in PDF...