Probably police slang, used when referring to a small pry-bar, or large screw-driver.
It can also be a bump key. It's basically a key that will work on any lock provided that it's the same type. It's a key that can be made using a triangular file and an old key.
The plural of the noun burglar is burglars.
Burglars - 1918 I was released on: USA: 24 February 1918
Burglars - 1919 was released on: USA: 16 November 1919
The cast of Burglars - 1919 includes: John Carr as Skinnay
The Mystical Burglars - 1902 was released on: USA: May 1902
Burglars at the Ball - 1907 was released on: USA: January 1907
The Acrobatic Burglars - 1906 was released on: USA: July 1906
yes
Yes
The Bungalow Burglars - 1911 was released on: USA: 16 December 1911
Jerry and the Burglars - 1917 was released on: USA: 1 December 1917
Burglars - 1918 II was released on: USA: 15 January 1918