The TengTools 3105025BL-C metric hex key 2.5 mm with ball point is designed for daily professional use. The key is made from durable chrome vanadium steel with a hardness of 52 HRC and features a black oxide finish that provides protection against corrosion. The long arm includes a ball point that allows work at angles up to 25, making it easier to access fasteners in confined spaces. The short arm has a precisely shaped straight hex profile for optimal grip and torque transfer.