Abstract: A radial guide device for a power saw apparatus to accommodate the radius of the circular pattern to be cut from a hard relatively smooth surfaced planar material. The present invention also contemplates a slidably movable pivot means to adjust a selectively adjustable radius on a fixed guide arm to provide the desired circular pattern in a selected planar material. More particularly, the invention relates to a guide device which allows for a portable electric circular saw to be mounted therein and as an insert to be guided at a desirable fixed radial direction as it transverses the material to be cut.