Wera Bit-Check 10 PZ Bi Torsion 2, with Bi Torsion Rapidaptor is designed for compact & organized tool storage. Utilising a unique combination of special material, hardening & precision manufacture, BI-TORSION bits are designed to prevent premature wear & 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 & rapid one-handed bit changes for insert & power bits. The holder spin sleeve allows the steadying of the screwdriving. Wera Bit-Checks feature a compact design to safely store bits & bit holders in a case which provides fast & easy tool selection. So slim it can fit into your pocket. Drive & size are colour coded for easy selection of the right bit.