please refer to the manufacturer's prospectus:

This BAHCO 1/4" Square Drive Socket Driver for 4 mm hex head screws (SKU 6709M-4) is a manual 1/4" socket driver intended for 4 mm hex head screws

Blade length: 150 mm

hvor forbindelse sker med en M12 skrue

Klinge for System 4 SoftFinish Unbraco 2 + 2mm m/kugle MIL4922121111 please refer to the manufacturer'sInterchangeable blade SYSTEM 4 (ball end hex) Description The Interchangeable blade SYSTEM 4 (ball end hex) with order number 00584 is a replaceable blade for Wiha SYSTEM 4. The blade has an internal hexagon of 2. 0 mm 2. 0 mm and an overall length of 120 mm. The material is chrome vanadium molybdenum steel, through hardened and with a black finish. The product is listed as part of the Wiha series 26937. Function and use As an Interchangeable blade