Metro

The Metro line of lock hardware

Metro belongs to Rocky Mountain Hardware's catalog of bathroom locks, cylinders, and latch trim rather than one hardware type on its own, listed within Knobs.co's broader lineup of hardware for interior doors and cabinetry, and built around a clean, minimal rosette shape available in square or round. This whole line shares that same geometric base, so a Metro bathroom lock and a Metro cylinder mounted on one door read as a coordinated system rather than two separate purchases.

Oval cylinder, euro profile, or bit-key

The Metro Oval Cylinder handles a standard pin-tumbler lock in a rounder housing, with lengths starting around 64mm x 114mm, stretching up past 64mm x 330mm for a mortise lock that needs more travel. Euro Profile cylinders come in round and square rosettes here, fitting European-style mortise locks more common on imported or older doors. For an old-fashioned keyed mechanism rather than a contemporary pin-tumbler cylinder, the Bit-Key option is available only in the square rosette.

Square rosette versus round rosette

The square rosette gives Metro a slightly more architectural, angular presence, whereas the round rosette softens that same hardware into a more conventional shape on the door. Both carry identical mechanisms underneath, so the choice comes down entirely to how the door's other trim is shaped, rather than to any functional tradeoff.

The bathroom lock and the latch trim

The Round Metro Bathroom Lock, at 57mm, handles a privacy function on an interior bathroom door, distinct from the keyed cylinders meant for exterior or higher-security doors. Latch Trim, sized at 64mm x 330mm, covers the strike plate and the surrounding hardware, matching the same Metro geometry and completing the lineup for a buyer outfitting an entire door in this line.

Metric sizing worth double-checking

Because Metro's cylinder and profile sizes run in millimeters instead of inches, confirming a door's existing lock measurements in that same unit ahead of ordering heads off a conversion error — an easy mistake on a line where several cylinder lengths sit close together, like 64mm x 114mm next to 57mm x 254mm.