This application is taken directly from the product description on the manufacturer's product page

Weller describes the Magnastat system

Manufacturer's Part Number: 111Z-3/4

Fault detection (defective cells

Bit serie 4 unbrako m/boring 1/4"; SW2x89mm Unit(s):Packet This application is taken directlyBits for Hex Socket (Innensechskant) The Wera 840 4 Z Hex Plus BO bit 05059640001 is a single WERA bit specified for hex socket (Innensechskant) screws, including variants with a security pin (BO). The product is listed as size 2. 0 mm and comes with a 1 4" hex drive (Wera connecting series 4). The blade length is 89 mm. Features Hex Plus profile: larger contact surfaces, designed to reduce notch effects and minimize damage to the screw head. Z type