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Adaptor from square to hexagonal. Suitable for the attachment of bits with ΒΌ" hexagon drive as per DIN ISO 1173-C 6.3. Drive: 3/8" squaret; comes with particularly strong retaining ring. Features and Benefits • 3/8" adaptor • Suitable for bits with 1/4" hexagon drive (Wera connecting series 1) • 3/8" square socket drive • Equipped with ball stop groove • Extra-strong Contents 780 B 3/8" Adaptor, 780 B/1-S x 1/4" x 30 mm