The Amerock Extensity 1-1/8 In. (29mm) Length Knob. Embodying a sleek yet stately look, Extensity effortlessly blends graceful arcs with a strong geometric quality, creating a strong aesthetic that commands admiration. Founded in 1928, Amerocks award-winning home solutions including decorative and functional cabinet hardware, bath accessories, decorative hooks and wall plates have built the companys reputation for chic design accessories that inspire homeowners to express their personal style. Amerock offers a variety of styles and finishes at affordable prices that add the perfect finishing touch to any room.