The power transmission from the nuts to the screw head is not via the corners, but via the flanks. This ensures higher power transmission, plus the sensitive edges of the nut remain intact. * Wrench size 19 mm https://elecena.pl/product/27172138/toolcraft-820773-1-2-quot-drive-socket-19mm 2024-11-07 https://elecena.pl/product/27172138/toolcraft-820773-1-2-quot-drive-socket-19mm 2025-07-30