Wera 840/1 ZBO Hex Pinned Security Bit Extra Tough 2.5mm 25mm Pack of 1

This Wera 840/1 ZBO bit is supplied in a 2.5mm hex size with a 25mm length, offering a slightly larger drive to tackle hexagon socket BO security screws that fall between the standard 2mm and 3mm options. It's a precise fit for applications where only the correct size will do — preventing cam-out and protecting both the bit and the fastener. The Hex-Plus profile increases the contact surface inside the screw head, significantly reducing the notching effect that leads to rounding and premature wear. Combined with extra tough construction, this bit holds up well in hard materials and high-torque scenarios.