Wera 20-piece set of high-quality V-bits for Square recess screws in a practical Bit-Box for easy removal. 1/4 inch hex, suitable for DIN ISO 1173 D 6.3 bit holders. The conical profile of the V-bits provides a clamping force to securely hold Robinson square screws on the tip of the tool, ideal for use in hard-to-reach places. The transparent back of the Bit-Box allows you to see how many bits are in the box.