11"W x 7"H x 5/8"D Springtime Stair Bracket, Left. With the beauty of original and historical styles, decorative stair brackets add the finishing touch to stair systems. Manufactured from a high density urethane foam, they hold the same type of density and detail as traditional plaster stair bracket products. They come factory primed and can be easily installed using standard finishing nails and/or polyurethane construction adhesive.