DDM Allen (Hex) BALL-END Hardened Steel Drivers - Set of 3 (,3,4,5mm).
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
Ball ends allow for working at angles, but are not as strong as the standard straight design. It is possible to break a ball end if too much pressure is used.