The Tolsen 55160 is a tubular knob lock designed for securing interior doors. It features a stainless steel knob with a 51 mm diameter and a matching iron rose measuring 65 mm, both of which are finished with a wear-resistant multi-layer coating to maintain their appearance over time. This lock is built for versatility, fitting doors with a thickness between 35 and 45 mm and supporting a backset of 60 to 70 mm. The internal mechanism relies on a brass cylinder and a rotational opening system, providing reliable operation for daily use. To ensure you have enough spares, it comes with three brass keys and is delivered in double blister packaging.