Further technical data and packaging information can be found in the manufacturer's datasheet:

The Wera 893/4/1 K Universal Bit Holder is used to hold and extend 1/4" bits in applications where the 50 mm blade length is suitable

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WERA describes 840/4 Z-bits as "tough" and intended for universal use

Bøsning SLB4-F/A fornikl. brun CAT III 1000V 24A MIL6231101401 Further technical data and packaging. Insulated, rigid, 4 mm, accepting spring loaded 4 mm plugs with rigid insulating sleeve. Brass sheet. The socket is screwed into pre drilled panels of plastic, metal, etc. Flat connecting tab 4. 8 mm 0. 8 mm, can be bent to 90, once only.