They are for a charger not jump starting. CTEK et al make comfort connectors. Get one with a fuse but only use it for low amp charging. If you use it for jump starting you will fry the cable as it isn't a large enough diameter.
See here

To jump start the car connect the positive to the starter motor terminal & the negative to the engine or the erth lead coming off the gear box to the chassis

JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger