Bit-Check 12 BiTorsion 1Product Description: Wera Bit Check 12 BiTorsion 1, with Rapidaptor is designed for compact and organized tool storage. Utilising a unique combination of special material, hardening and precision manufacture, BI TORSION bits are designed to prevent premature wear and dramatically extend service life. The patented Torsion zone absorbs peak stress loads that normally destroy bits. BTZ EXTRA TOUGH bits are suited to hard, METAL JOINTING, threaded