Pamindo Mini Carabiner Small with Lockable Screw Closure for Attachment/ Carabiner Clips made of Rust-Proof Aluminium for Key Clips or Camping - 2 pieces set, black : Amazon.co.uk: Sports & Outdoors
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smallest locking biner?
A4909-3T: Mini karabiner for 25 mm webbing - triple safety lock - Apco Aviation Ltd.
Brotree Small Carabiner Clips Mini Locking Carabiner - 6cm Aluminum D-Ring : Amazon.co.uk: Sports & Outdoors
DMM - XSRE Lock Captive Bar Mini Carabiner – Dick's Climbing