Jonard TTB-6 Steel Barrel Lock Plunger Key (for Channell LK03029817 and Highfield 93180775-S CATV pedestal Locks) Plunger Key Compatible with Channell Highfiled and InnerTite CATV barrel locks. The barrel lock plunger key is compatible with several types of Highfield and Innertite barrel locks with inside diameters ranging from .176" to .196 Works on Channell LK03029817,Highfield 93180775-S and other similar Locks.