Double wide shaft collars are manufactured in one- and two-piece clamp type. They have 25% more holding power than equivalent size and type standard collars. Double wides can be used as a short rigid coupling in space restricted applications that will not fit a standard sized rigid coupling. Ruland manufactures double wide shaft collars in 1215 lead-free steel with a proprietary black oxide finish, 303 stainless steel, and high-strength 2024 aluminum. Bore sizes range from 1/8" to 2" and 6mm to 25mm.