Kolbe Windows & Doors has added radius direct set windows to its VistaLuxe Collection. The windows feature the slim lines, narrow frames and square details of VistaLuxe products. The slim lines, paired with optional black-painted interiors, can give the appearance of steel, at a lower cost and with shorter lead times. VistaLuxe radius windows are offered as stationary direct sets in Flush and Accent styles. Radius units are available in full circle, oval, half circle, quarter circle, segment head, quarter segment and other custom shapes.