jiggler, n.¹ — Green’s Dictionary of Slang

jiggler n.¹

[SE jiggle, i.e. using the sleight of hand required to turn the lock, but note jigger n.¹]

(UK Und.) skeleton keys for use on pin tumbler locks.

1949		Monteleone Criminal Sl. (rev. edn) 132: jiggler A lock pick.
1977		D. Powis Signs of Crime 189: Jigglers Skeleton keys for pin tumbler locks.
1989		J. Morton Lowspeak.