【Cable Ferrules】: 1640 pcs crimp terminal connectors set includes 590 pcs pre-insulated cable ferrules and 1050 pcs uninsulated crimp terminals. Interface type: AC/DC. Operating frequency: low frequency. 【Uninsulated Splice Connectors】: 5 types of uninsulated electrical terminals: 0.5 mm² (400 pcs), 1.00 mm² (200 pcs), 1.5 mm² (200 pcs), 2.5 mm² (150 pcs), 8 mm length. 4.00 mm² (100 pcs), 9 mm length. 【Pre-Insulated Terminals】: Insulated cable ferrules with PVC heads in 5 types: red 0.5 mm² (200 pcs), blue 1.00 mm² (150 pcs), black 1.5 mm² (100 pcs), yellow 2.5 mm² (80 pcs), green 4.00 mm² (60 pcs). 【Application】: The uninsulated crimp ferrules can effectively prevent wire ends from fraying or breaking. The copper cable ferrules have good electrical and thermal conductivity, which can provide reliable connections. These ferrules are designed with insulation flanges, making it easy to insert the wire. 【Tinned Copper】: The electrical splice connectors are made of red copper, tinned to prevent oxidation and rust, more durable to use. Widely used for electrical projects, workshops, auto mechanics, machinery, cars, trucks, motorcycles, etc. 【How to Use】: Remove the wire core from the casing. The stripping length should be equal to the metal sleeve of the terminal. Place the entire core inside the cable end ferrule terminal without exposure, then crimp the terminal. Before that, adjust the crimping tool according to the thickness of the wire core.