• Compatible with all Halti and Halti Optifit head harnesses. • Provides an additional layer of security to prevent accidental escapes. • Easy to use: attach the metal clip to the D-ring of the collar. • Simple installation: replace the old link and place the new one through the leash ring. • One size fits all Halti and Halti Optifit collars. • Product dimensions: 15 cm long, 4 cm wide, and 3 cm high. • Product weight: 0.02 kg.