Wera Bit-Check 10 PZ BiTorsion 2, with BiTorsion 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 combines with that of the Rapidaptor holder to absorb peak stress loads that normally destroy bits. BTH EXTRA-HARD bits are suited to general WOOD APPLICATIONS. The holder with quick-release chuck offers press-in auto-lock and rapid one-handed bit changes for insert and power bits. The holder spin sleeve allows the steadying of the screwdriving. Wera Bit-Checks feature a compact design to safely store bits and bit holders in a case which provides fast and easy tool selection. So slim it can fit into your pocket. Drive and size are colour coded for easy selection of the right bit.