The Kong 411 with optional captive pin

This screwgate, modified D carabiner is made by Kong.  Popular with rescue teams, these large carabiners can accept lots of gear.  It has a MBS of 50 kN, is silver in color, & made of carbon steel for high strength. 

Technical specifications:

Strength: 50 kN long axis, 20 kN open gate, 13 kN short axis

Length: 114 mm

Weight: 247  g

CE, UIAA, OSHA certified