Here's what other sites are saying:
One of the most popular Omega carabiners, the Modified D is built from aircraft quality aluminum alloy. Internal locking threads eliminate rope wear. This "light use" carabiner is ready for at least 6,000 lbs. according to the NFPA. Specifications: 1 kn = 225 lbs of force Strength Closed: 30 kN113.8mm L x 70.6mm W
Screwlok D Locking Carabiner - For rescue and safety use, there is no better partner than these locking carabiners. Strong, and dependable, they're made from quality materials that won't let you down. They are forged with " steel to achieve a perfect balance of weight and strength. They are subjected to a scientific heat treatment to lock in strength by consistently aligning the crystalline grain structure of the metals, then plated for corrosion resistance. Every single one of them is proof-tested to half its rated strength, providing you with assurance that it will meet the demands you put on it. The manual locking mechanism prevents accidental openings. The modified D shape allows the gate to open wider. This 'biner is a must for every rescue kit.
The large Omega Pacific 1/2 Large Screw-Lok D carabiner uses the highest aircraft quality, certified aluminum alloy and is the standard for the fire and rescue market.
- Mountain Gear
The Omega Pacific 1/2 Modified D Screw-Lok Carabiner is made of aircraft quality aluminum. The internal locking threads eliminate rope wear, while Omega Pacific's signature flat spin riveting ensures that all rivets are flush with gates. Exceeds the National Fire Protection Association's regulations for strength and construction
Omega Pacific 7/16" Modified D Screw-Lok
Omega Pacific 7/16" Modified D Quik-Lok
$34 - $39
Omega Pacific 1/2" Modified D 3-Stage Quick-Lok
Omega Pacific 1/2" Modified D NFPA Quik-Lok
Omega Pacific 1/2" Steel Modified D NFPA Screw-Lok
Omega Pacific 1/2" Standard D Screw-Lok
Omega Pacific Jake Jr. Screw-Lok
DMM Revolver Screwgate