570pcs Heat Shrink Butt Connectors，4 Specifications： 100pcs White Awg 24-22 0.3-0.5mm² 200pcs Red Awg 22-16 0.5-1.5mm² 200pcs Blue Awg 16-14 1.5-2.5mm² 70pcs Yellow Awg 12-10 4-6mm² Product Parameters Tube Shrink Ratio: 3:1 Tube Material: Polyolefin Inner Barrel Material: Copper Minimum Shrink Temperature: 175F (80C) Full Recovery Temperature: 265F (130C) Operating Temperature: -65F–255F (55C - 125C) Operation Steps 1. Fit - Select The Proper Wire Gauge Heat Shrink Connectors To Fit Wire Size 2. Strip - Strip Wire Insulation To 8mm And Insert The Strand Copper Into Splice Barrel 3. Crimp - Crimp The Tinned Copper Barrel(Once On Each Wire Joints) With A Professional Crimper 4. Heat - Heat Evenly By Rotaing The Connector With A Professinal Heat Gun 5. Done - Wait For The Butt Connector Cooling Down And Get Your Projects Done Package Content 1 Box Heat Shrink Butt Connectors Kit Operation Steps 1. Fit - Select The Proper Wire Gauge Heat Shrink Connectors To Fit Wire Size 2. Strip - Strip Wire Insulation To 8mm And Insert The Strand Copper Into Splice Barrel 3. Crimp - Crimp The Tinned Copper Barrel(Once On Each Wire Joints) With A Professional Crimper 4. Heat - Heat Evenly By Rotaing The Connector With A Professinal Heat Gun 5. Done - Wait For The Butt Connector Cooling Down And Get Your Projects Done Customer Satisfaction We Stand Behind The Quality Of Our Products, As Well You Would Enjoy:Customer Service (Reply To You Within 48 Hours)