MODEL REF: ZM-B MECHANICAL CODE DOOR LOCK STYLE: KNOB STYLE FEATURES: 1. NO NEED BATTERY AND ELECTRICITY, FULL MECHANICAL DESIGNED. 2. EASIEST WAY TO CHANGE COMBINATIONS AND NO NEED REMOVING THE LOCK FROM DOOR, ONLY SPEND YOU SEVERAL SECONDS. 3.CAN LOCK IT AUTOMATICALLY WHEN CLOSE THE DOOR. 4.WEATHER PROOF AND WATER PROOF. 5.COMBINATION CAN BE SELECTED FROM 1 DIGIT TO 12 DIGITS. 6. BOTH FIT FOR RIGHT HANDED OPEN DOOR AND LEFT HANDED OPEN DOOR. REMARKS:1, TUBULAR DEADLOCKING LATCH ARE OK. 2, WILL WORK FOR DOOR THICKNESS FROM 35MM-55MM, THICKER IS WORKABLE. PLEASE VISIT WEBSITE FOR LOCK SIZE AND PACKING DETAILS.