Reference: Wrenches set (open)
Materials: Beryllium copper Cu-Be
Models: SET Open-end wrenches
76400 - 6-7, 8-9, 10-11, 12-13, 14-15, 16-17mm
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.