From an unused root meaning to twine or braid together; a fetter -- fetter.
H3525. kebel
כֶּ֫בֶל noun [masculine] fetter(s), late; — singular collective ׳בַכּ רגליו עִנּוּ Psalm 105:18 they humbled his feet with fetters ("" בַּרְזֶל); plural construct בַרְזֶל בְּכַבְּלֵי אסר 149:8 ("" זִקִּים).
כבן (√ of following, meaning dubious; Late Hebrew כָּבַן, Aramaic כבן, = wrap round, wrap up).