Mdrive Allen Ball Hex Spare Bits 3.0mmM DRIVE Hex Allen Wrench Spare Tip 3mm Ball Hex High quality hex allen wrench spare HSS steel ball tip. Specs: Length: 100mm Tip Bits Hex Size: 3mm (ball) Tip Bits Diameter: 3mm Tip Bits Material: High quality HSS Suitable for: M4 hex screws with allen head M5 hex screws with countersunk head M5 hex screws with button head Note that a ball head hex allen tool tip always wear faster that a straight hex. They are also more easy to brake when dropping