9pcs long arm allen key set , 45# Carbon steel with heat treated colorful finishing 9pcs long arm allen key set ,45# Carbon steel w/ heat treated colorful finishingFull series hex key set45# carbon steel ,42 HRCLong arm or short arm can be customized.1.5-2.0-2.5-3.0-4-5-6-8 9pcs long arm allen key set ST9829S