Home > Products > Moulding > Window Sill & Nosing > Treated Window Sill [1-3/8″ x 6-1/8″] This moulding is available in: Clear Treated Yellow Pine It is sold by the linear foot in random lengths up to 12′ long. Tier quantity discounts available on all mouldings, any combination or style. Add to basket for Quote * Please select length and quantity to add to basket for quote.