The two convicts were handcuffed together, and had irons on their legs, —irons of a pattern that I knew well.
两个罪犯被铐在一起,腿上有铁,这是我非常熟悉的图案的铁。
英语百科
Legcuffs
(重定向自Leg irons)
Legcuffs are physical restraints used on the ankles of a person to allow walking only with a restricted stride and to prevent running and effective physical resistance.
Frequently used alternative terms are leg cuffs, (leg/ankle) shackles, footcuffs, fetters or leg irons.
The term "fetter" shares a root with the word "foot".