The ‘3 IN 1’ cylinder has been designed by Mul-T-Lock to allow users to easily change their key combinations.

It’s a simple and speedy process the user inserts and operates the next key in a sequence of three keys and the introduction of each new key invalidates the previous key combination.

The product is packaged with three key types, colour-coded and clearly marked in a sequence, to guide the customer in the correct usage. First, they use the green set of keys.

Then, when they need to change the combination, they start using the yellow key (after which the green key will automatically be cancelled). And if they need to change the combination again, they use the red key (after which both the yellow and green keys will automatically be cancelled).

When all three combinations have been used, the cylinder may be re-keyed by a Mul-T-Lock authorised locksmith.

The ‘3 IN 1’ cylinder can be ordered with three separate duplicating cards for green, yellow and red keys.