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STAHLWILLE 1/4' Bit Holder nº 4121/4 inside hexagon, DIN 3126/ISO 1173 D 6.3. Internal hex drive with a collar-thrust spring. Bits are easy to insert, lock securelyin position and can be removed just as easily; even hex bits with a wide groove (Type E, DIN 3126/ISO 1173). HPQ® high performance steel.
