The Sargent 8237-LNB-26D Classroom Mortise Lock Function comes LA keyway Standard with an LN Rose and a B Lever in a Satin Chrome Finish. When it comes to strength and durability, SARGENT continues to set standards with the 8200 Mortise lock. The 8200 far surpasses ANSI/BHMA A156.13 Series 1000 Grade 1 standards.