75MM 37.5/37.5 Brass Key Cylinder Door Lock Barrel High Security Anti Snap Lock

Description: Double side keyholes The key cylinder size is 37.5/37.5 (37.5mm +37.5mm) Comes with 7 keys: 4pcs A keys, 2pcs "B" keys, 1pc "C" key "A" and "C" keys only for home owner, "B" keys only for the qualified installation person Lock Total Length: Approx. 2.95 inch / 75 mm Key Hole Size: Approx. 0.39 inch / 10mm Color: Brass tone Material: Brass Operating Instructions: "A" and "C" keys only for home owner, "B" keys only for the qualified installation person "C" KEY CAN NOT BE USED BEFORE KEY CYLINDER INSTALLED WELL After installation finished, the home owner puts the "C" key into the door and turns 360 degrees, then the "B" keys will be disabled; "A" and "C" keys are used normally Can not use any kind of lubricating oil, in particular cases, you could use a little industrial white wax or pencil powder Package Includes: 1 x Key Cylinder 7 x keys