Wera Bit-Check 7 PZ Diamond 1, with 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 absorbs peak stress loads that normally destroy bits. 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. Bi Torsion DIAMOND COATED (BDC) bits ensure safe working, especially driving screws into delicate materials or high-quality surfaces, preventing slip. in addition, where screws are driven into resistant materials such as hard woods, concrete screws & ABS plastics DIAMOND COATED bits “bite” into the fastener ensuring a secure fit & reducing cam-out effect, extending the life of the tool & ensuring screws are fully driven home. Wera Bit-Checks feature a compact design to safely store bits & bit holders in a case that 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.