This is an Alden Micro Grabit Broken Bolt Extractor Kit. The part number is 4507P. The Micro Grabit 4 piece extractor kit can quickly remove broken bolts and screws and (flip style) even drill on center using a 1/8 in. variable speed reversible rotary power tool (slow speed) or quality power screw driver with expandable chuck or 3/8 inch reversible power drill for the 2367P. It quickly and easily removes most broken bolts No. 5 and 6 (3mm) to 1.4 inch (6mm) from wood, metal or plastic. And it can drill up to grade 8 and class 10.9 fasteners. It is precision engineered for multiple extractions and maximum performance. The serrated extracting end of tool results in greater torque for hard to remove bolts.
Included in Kit:
Micro Grabit #1 - No. 5&6 (3mm)
Micro Grabit #2 - No. 8 (4mm)
Micro Grabit #3 - No. 10 (5mm)
Micro Grabit #4 - 1/4-in (6mm)