Uses one mounting screw. Also has two studs on the back of the knob which depress into the cabinet door surface to keep the square knob from twisting on the door.
Residential Essentials 10269AP Cabinet Knob
Measurements
Diameter-1 3/16 Inch
Projection-15/16 Inch
Base Diameter-13/16 Inch
Residential Essentials is packed with two different screw lengths to accommodate most cabinet drawer or cabinet door applications.