Abstract: An improved roof drain having a wide flange, a base, and a means to secure attachments such as strainers to the base. The attachment means is characterized by being simple and permanent. In one embodiment, the strainer contains a peripheral flange which is rolled-into the large horizontal flange of the base during fabrication. Other attachments such as gravel stops and the like may be attached in a similar fashion. The base is an integral piece typically made from spun aluminum. An alternative embodiment includes a two-part generally annular clamping ring, the lower portion of which includes integral threaded studs. The lower portion of the clamping ring is permanently attached to the base again by being rolled into the large flange on the base.