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The product is stated as suitable for cleanrooms and can withstand temperatures from -20 to +70 °C

The Wiha SoftFinish electric slotted screwdriver (00821) is described by the manufacturer as an insulated hand tool where both blade and handle dimensions

The manufacturer's official material includes technical documentation and images

Bit serie 1 unbrako 1/4"; SW5,0x25mm Unit(s):Packet This indication is the onlyBits for internal hexagon screws Wera 840 1 Z bits Description Wera 840 1 Z bits (item number 05056325001) are bits for internal hexagon screws designed for universal use. The product features Wera's Hex Plus profile, which provides larger contact surfaces in the screw head and reduces the notching effect. The bit is classified as a "zhharte" (tough) Z bit, designed to prevent premature tip breakage. Technical function and connection Wera 840 1 Z bits