Reference: Safety set maintenance 38pcs
Materials: Beryllium copper Cu-Be
Combination wrenches 10, 11, 12, 13, 14, 15, 17, 19, 22, 22 and 24mm
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.