Bullseye SD Locks is pleased to offer a direct replacement for the Ilco 5400 and Sargent & Greenleaf 4500 half-inch Double Changeable SD Lock.  The Bullseye B5445-BR-BA4 has the same foot print and is a true half inch nose—no guard key modification required.  It will come factory set to the BA4 guard key. The new lock will be available this summer from all Bullseye distributors.