The Sargent 76 Commercial Mortise Door Lock and Knob Thumb Turn is a durable and high-quality door hardware set suitable for both commercial and residential use. Made of steel with a brass finish, this reversible lock and knob set from the reputable brand SARGENT is designed for heavy-duty commercial applications. The set includes one lock and one knob, both in a universal/reversible design to fit various door handings. Manufactured in the United States, this product is built to last and provide security for your business or home. This is an estate find wysiwyg. I know nothing about it other than the knob turns. Lmk if you have more info or resources on it.