The factory standards include four types of "Cut Out".

Type A:

Curved Flush Cut-out：classic curved and flush, fits the frame, suitable for standard sizes, and looks nice when installed.

Type B:

Curved Offset Cut-out：curved offset, reserves operating space, suitable for complex installation scenarios.

Type C:

Rectangular Flush Cut-out：square and flush, simple lines, suitable for modern homes, easy to maintain.

Type D:

Rectangular Offset Cut-out：square offset, reserves operating space, suitable for complex installation scenarios.