DMM Professional - The PerfectO locking carabiner has the same symmetric oval profile as the classic Ultra O but is 15 mm shorter while still maintaining a full strength rating. Its compact
DMM PerfectO LockSafe Carabiner- A597 – J.L. Matthews Co., Inc.
DMM PerfectO Locksafe Carabiner | TreeStuff
DMM Professional - Compact and light, the PerfectO literally fits in the palm of your hand. Ideal where weight reduction and smaller connectors are desired. | Facebook
PerfectO Carabiner by Dmm || WesSpur Tree Equipment