GLW describes in the prospectus that insulated wire end ferrules like this are used to gather and protect stranded wire ends and simplify insertion into terminals

Length: 152 mm (6")

as stated by Wera

mounting dimension M10

Gedore 3/8" top 17mm MIL371101111 GLW describes in the prospectusProduct Overview GEDORE Socket 3 8" hex 17 mm (6234580) This socket is a 17 mm hex socket for 3 8" square drive, supplied by GEDORE under item number 6234580. The product is intended for manual operation and is constructed according to the manufacturer's specified standards and materials. Construction and Materials Material: Chrome vanadium steel 31CrV3 (stated by the manufacturer). Surface: Polished and chrome plated. Drive: 3 8" square drive (drive