9x Allen Wrench Hex Key Set Long Arm Cr-V Steel 1.5-10mm Alan Key DIY Mechanics
In the market, there is a normal type, it is only carbon steel material, and the hardness is only about 48 degrees. Allen wrench. It is a 9pcs set, the sizes are 1.5, 2, 2.5, 3, 4, 5, 6, 8, and 10mm.