• These are a copy of the tektro RL726 (silver in the pics -for illustration- and not included. This listing is for a pair of the black ones  - as shown in the first picture. They are only c. 5 grams heavier than the tektro RL726, (probably lighter than the RL526) but much better value!
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• Nominally 26.0mm clamp fitting, but will also fit 25.4mm fine
• hinged clamp
• cable adjuster
• lever stop adjuster
• c. 41grams each

they will also work on their own (without drop levers further down the line) - not as interference brake but as the only lever. - the hinge and their smallness makes them popular for fixie / track bikes as the brake is easily removed and fitted without having to fiddle with bar, tape, stem etc. 

will fit less than 25.4 - with shims (not supplied)