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"Fit him with a restraining bolt and take him back to His Excellency's main audience chamber."
EV-9D9, regarding C-3PO[3]

Restraining bolts were small, cylindrical devices that could be affixed to a droid in order to limit its functions and enforce its obedience.[2] When inserted, a restraining bolt restricted the droid from any movement its master did not desire, and also forced it to respond to signals produced by a hand-held control unit[4] known as a caller.[5] The commands were usually limited to three simple orders: "Come" "Halt" and "Orders".[6] Some droids felt sheer horror at the mere mention of restraining bolts.[7] Restraining bolts were also used in the construction of Jawa ion blasters; they, along with accu-accelerators from a starship's ion engine, were fitted to the blaster's firing mechanism.[8]

Droids could not remove restraining bolts from themselves.[9]. In one exception to this rule, however, the droid L3-37 removed several restraining bolts from other droids during a revolt of slaves and droids on Kessel.[10]

Sabine Wren would sometimes threaten Chopper with a restraining bolt when he was uncooperative.[11]

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