Projahn Screwing Tools for Hanger Bolts 6.3 / 1/4 Inch with Internal Thread For damage-free screwing in and out of hanger bolts and stud bolts. Ideal for cordless screwdrivers thanks to 6.3 [1/4 inch] hexagonal shaft. Technical details: Size M6 Quality level: plus. Material: chrome vanadium steel. Surface: zinc phosphated. Standard(s): DIN 3126 / ISO 1173. Drive: external hexagonal according to DIN 3126 / DIN ISO 1173 – E 6.3 1/4 inch. Output: external hexagonal. Design: with internal thread for hanger bolts. Application: hand-operated and electric screwdriver. Box contents: Projahn Screwing Tools for Hanger Bolts