The TTB-6 Barrel Lock Plunger Key is compatible with barrel locks with inside diameters ranging from 0.176" to 0.196" made by Channell, Highfield and Innertite. Works on Channell LK03029817, Highfield 93180775-S and used in CATV Pedestal Applications. This key may also fit other locks used in the electric, gas and water utilities. Know your lock size before purchasing.