For 1/0 gauge wire. A ferrule is crimped onto stranded wire using a crimping tool (compression, ratchet, or pneumatic mechanism) to turn stranded wire into solid wire. Ferrules are available in strips or reels for use with automatic crimping machines or multi-purpose crimping tools. The dimensions of this wire ferrule are 20mm in length, with a bottom diameter of 12.7mm and an upper diameter of 10.9mm. Product include a total of 24pcs wire ferrule, which can completely meet your daily use needs and replacement., Manufacturer: YINETTECH