The wera bit check 12 bi torsion 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 their patented torsion zone absorbs peak stress loads that normally destroy bits btz extra tough bits are suited to hard metal jointing threaded fasteners and general use the holder with quick release chuck offers press