Features: 
100% brand new and high quality. 
With high quality and durable performance.
Dual-walled design, polyolefin tubing in outside and hot melt adhesive in inside.
Allows visual inspection, prevents corrosion, and provided a waterproof seal. 
standard crimp and then seal heat shrink butt connectors. 
For best results use a hot air gun until it reduces in size and the adhesive flows, filling gaps within the terminal. 

Specification: 
Quantity: 1000/500pcs
Color: Red/Blue/Yellow
Material: PE+Copper
Red connectors: Suits cable/ wire sizes 0.5-1.0mm² 22-18AWG
Blue connectors:Suits cable/ wire sizes 1.5-2.5mm² 16-14AWG
Yellow  connector: Suits cable/ wire sizes 4.0-6.0mm² 12-10AWG

Package Included: (The items you select)
1000/500pcs Heat Shrink Crimp Connectors

How to Use:
1. Insert the two wires to the right size connector.
2. Crimp the metal part in the middle of the butt connector by pliers.
3. Apply heat to the two end of the connector to make it tighten up the wire.

Note:
Please allow 1-5mm errors due to manual measurement.
Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.