Easily open and close E4 series energy chains

Overview opener for Chains

• A = for the upper cross-bar width | 650 opening cross-bar
  
• B = for the lower cross-bar width | 450 opening cross-bar
  
• C = for the upper cross-bar width | 450 opening cross-bar
  
• D = for the upper cross-bar width, both sides | 450 opening cross-bar