The Wera Bit-Check 30 Diamond 1, with Rapidaptor is designed for compact and organised 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 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. Its spin sleeve allows the steadying of the screwdriving. BiTorsion Diamond Coated (BDC) bits ensure safe working, especially driving screws into delicate materials or high-quality surfaces, preventing slip. 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. It is so slim that it can fit into your pocket. Drive and size are colour coded for easy selection of the right bit. This 12 piece set includes the following:1 x 1/4in x 50mm Rapidaptor Universal bit holder7 x BiTorsion 25mm BDC Phillips bits: PH1 (x2), PH2 (x4), PH3,7 x BiTorsion 25mm BDC Pozidriv bits: PZ1 (x2), PZ2 (x4), PZ312 x BiTorsion 25mm BDC Torx bits: TX10 (x2), TX15 (x2), TX20 (x3), TX25 (x3), TX30, TX40.3 x BiTorsion 25mm BDC Slotted bits: 0.8x5.5mm, 1.0x5.5mm, 1.2x6.5mm. Suitable for use with drill/drivers; for impact machines use IMPAKTOR.