WKK Cord End Terminals Ferrule 621383 - WKK Ce 060012W, WKK manufactures the Ce 060012W ferrule, which is partially insulated and suitable for 6 mm² wires. This black ferrule is typically used for secure and efficient crimping applications. Available in packs of 100, it is ideal for electrical installations requiring reliable wire terminations. WKK 060012W Ferrule 6 mm² Partially Insulated Black 100 Pieces