The Wera Bit-Check 30 BiTorsion 1, with Rapidaptor is designed for compact and organised tool storage. Utilising a unique combination of special material, hardening and precision manufacture, 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. BTZ Extra-Tough bits are suited to hard, metal jointing, threaded fasteners and general use. 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 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 30 piece set contains the following:1 x 1/4in x 50mm Rapidaptor Universal bit holder9 x BiTorsion 25mm BTZ Phillips bits: PH1 (x2), PH2 (x5), PH3 (x2).10 x BiTorsion 25mm BTZ Pozidriv bits: PZ1 (x2), PZ2 (x6), PZ3 (x2).10 x BiTorsion 25mm BTZ TORX® bits: TX10, TX15 (x2), TX20 (x2), TX25 (x2), TX30 (x2), TX40. Suitable for use with drill/drivers; for impact machines use IMPAKTOR.