this application is directly stated in the manufacturer's product text

and the screwdriver has a hexagonal head in size 8 mm

Product name: ESD Compact 15 (Article number 104432)

Manufacturer's installation instructions available in the provided datasheet

Top 14mm 1/4" 1000V isoleret Unit(s):Set this application is directly statedInsulated Socket Wiha 43099 The Wiha 43099 is an insulated socket designed for working near live parts. The product is identified as an insulated socket with a 1 4" external hex drive and a hex size of 14. 0 mm. The total length and outer dimensions of the socket are stated as 42 mm and 42 x 18 x 18 mm (LxWxD) respectively. Function and safety The socket is individually tested at 10,000 V AC and is rated for safe use near live parts up to 1,000 V AC