Cable Ferrule Kits: 1640 Crimp Lug Connector Set includes 590 Pre-insulated wire ferrules and 1050 non-insulated crimp terminals. Interface type: AC/DC. Working frequency: low frequency.Non-Insulated Butt Connectors: Non-insulated electrical lugs of 5 types: 0.5 mm (400 pieces), 1.00 mm (200 pieces), 1 .5 mm (200 pieces), 2.5 mm (150 pieces), length 8 mm. 4.00mm (100pcs), 9mm length.Pre-insulated terminals: insulated wire ferrules with PVC heads in 5 types: red 0.5mm (200pcs), blue 1.00 mm (150 pieces), black 1.5 mm (100 pieces), yellow 2.5 mm (80 pieces). , green 4.00mm( 60 pieces).Application: Non-insulated crimp ferrules can effectively prevent the wire ends from being stripped or broken. Copper wire ferrules have good electrical and thermal conductivity, which can provide reliable connections. These ferrules designed with insulation flare make it easy to insert the wire.Tinned Copper: The electrical butt connectors are made of red copper, tinned to prevent oxidation and rust, more durable use. Widely used for electrical projects, workshops, auto electricians, machinery, cars, trucks, motorcycles, etc.How to use: Remove the wire core from the case. The stripping length should be as long as the metal sleeve of the terminal. Place the entire core inside the ferrule terminal of the wire end without being exposed, then crimp the terminal. Before that, please adjust the crimping tool according to the wire core thickness.