See also: Shackle in Pictorial Dictionary of Heraldry.
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Shackle §
A lockable collar or restraint for a limb.
No default orientation. No proper coloration.
Source: Pennsic Heralds’ Point Artists. Artist: Myfanwy ferch Rhiannon.
Shacklebolt §
A pair of manacles joined by a short bar, similar in function to modern handcuffs.
Default orientation: fesswise. No proper coloration.
Source: Banners, Standards, and Badges. Artist: Thomas Willement. (Page 258, badge of Percy, Earl of Northumberland.)