Ruland offers shaft collars in aluminium, black oxide carbon steel and stainless steel, as well as engineered plastic collars. One- and two-piece clamp-style designs are available with bore sizes from 3mm to 80mm. Clamp-style shaft collars do not mar the shaft like traditional setscrew types (DIN 705). Clamp-style collars also have higher holding power because they wrap around the shaft when tightened thus applying compressive stress nearly uniformly on the circumference of the shaft. Two-piece clamp-style collars have an additional advantage since they can be installed on the shaft without removing other components. Forged socket hardware is used in all shaft collars, which allows for higher screw torque and increased holding power.