Set of three hardened steel allen bits for electric drills and hand tools.
Each bit is 6.25 inches (160mm) in length. These are 1/4" shaft size, and compatible with electric drills and hand tools that accept 1/4" bits.
Sizes include 3.0 ,4.0, 5.0mm
Note: These drivers (due to their long length and very small necks) should not be used for initial loosening or final tightening. They will break if subjected to too much pressure. They are great for reaching tough areas and making bolt removal simpler and faster, but do require care when using.