Round Terminal (F)
Electrical connections with this connectors were made and are still made mostly in french cars. (Citroen, Peugeot etc.)
Please Note: do not get mixup with 4.7mm bullet terminals which are used in british cars.
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ERSF4x

Round terminals

Round terminals non insulated for crimping; for wire up to 2.5qm; Material: brass
ERSF3x

Round terminals 3mm

Round terminals non insulated for crimping; for wire up to 2.5qm; Material: brass