The Bit-Check 7 Diamond 1, with Rapidaptor is designed for compact and organised tool storage. Utilising a unique combination of special materials, hardening and precision manufacturing, BiTorsion bits are designed to prevent premature wear and 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 and rapid one-handed bit changes for insert and power bits. The holder spin sleeve allows the steadying of the screwdriving. BiTorsion Diamond Coated (BDC) bits ensure safe working, especially when driving screws into delicate materials or high-quality surfaces, preventing slipping. Additionally, where screws are driven into resistant materials such as hard woods, concrete screws and ABS plastics Diamond Coated bits \'bite\' into the fastener, ensuring a secure fit and reducing cam-out effect. This extends the life of the tool and ensures screws are fully driven home. Wera Bit-Checks feature a compact design to safely store bits and bit holders in a case that provides fast and easy tool selection. The case is so slim, it can fit into your pocket. Drive and size are colour coded for easy selection of the right bit. This 7 piece set contains the following:1 x 1/4in x 50mm Rapidaptor Universal bit holder6 x BiTorsion 25mm BDC bits: PZ1, PZ2, PH1, PH2, SL5.5, SL6.5. Ideal for use with drill/drivers; for impact machines use IMPAKTOR bits.