Black Diamond Pearlock Twistlock Carabiner Gray One Size. The twistlock gate gives this pear-shaped workhorse an added layer of security. Specifications for Black Diamond Pearlock Twistlock Carabiner: Manufacturer: Black Diamond Size: One Size Color: Gray Fabric/Material: Aluminum Steel Plastic Weight: 84 g Features of Black Diamond Pearlock Twistlock Carabiner Large rope-bearing surface for smooth operation and added longevity Hot-forged for lighter-weight construction Twistlock sleeve Package Contents: Black Diamond Pearlock Twistlock Carabiner Black Diamond BD2102041003ALL1: Pearlock Twistlock Carabiner Gray One Size