Robust Bit-Check by Wera. Bit-Checks provide a quick overview of the tools available. Bits not needed are simply reinserted into the set and do not get lost. Simple transportation e.g. in the shirt pocket. The Hex-Plus profile offers a greater contact surface in the head of the screw. The notching effect is therefore reduced to a minimum and damage to the screw head more or less eliminated. Tough viscous for universal use. Includes universal holder for the take-up of bits with ¼" hexagon head drive as per DIN ISO 1173-C 6.3. Comes with quick-release chuck for rapid bit change; the strong permanent magnet holds the bits absolutely securely.