Kolbe ' Kolbe's Craftsman Collection features doors handcrafted out of douglas fir, knotty alder or knotty pine (pictured). Door stiles constructed of selected core blocks are joined with an industrial finger-joint before placing between two select grade edge strips and veneer facings. High-frequency electronic curing along with Type 1 waterproof glue creates a strong bond. Stile and rails are held together with 5/8-in. splined hardwood dowels.