Wera Bit-Check 7 Universal 3, General Purpose bit set for drill/drivers with stainless holder is designed for compact & organized tool storage. EXTRA-TOUGH (Z) bits are suited to hard metal jointing, threaded fasteners & general use. With slim Stainless Universal bit holder with ring retention for insert & power bits. Wera Bit-Checks feature a compact design to safely store bits in a case that provides fast & easy tool selection. So slim it can fit into your pocket. Sorted by drive & size, tools are easy to locate & return to proper position, making missing products easy to identify. Unique to Wera, Robertson Square-Plus bits drive from small flat areas either side of the points, spreading the load & thus allowing more torque to be applied.