JBF National latch strikes are manufactured from the highest quality materials. They are designed and tested for ultimate reliability and durability. SK-4000 is manufactured from yellow and clear zinc steel, or clear passivated stainless steel. Please see component diagram below.

JBF National Part NumberMaterial / Finish
SK-4000-ST-CZ-218Steel / Clear Zinc 
SK-4000-SS-CP-218Stainless / Clear Passivated 
SK-4000-ST-YZ-218Steel / Yellow Zinc