897/4 R Rapidaptor BiTorsion Universal Bit HolderProduct Description: Wera 897 4 R Rapidaptor BiTorsion bit holder for drill drivers. Wera created the BiTorsion system to maximise the service life of bits in drill drivers. The combination of both the torsion zone in the holder and the torsion zone in the bit dramatically extends the service life. The BiTorsion system absorbs the peak loads from drill drivers and therefore the drive tip is protected. Rapidaptor technology has been developed by Wera