24 sizes in total of 1.5 - 2.4 inches (38 - 60 mm) and 2.5 inches (63 mm) outer diameters.
Uses a machined aluminum body (no anodized processing).
Two installation locations for safety
Includes 2 stainless steel cap bolts (M6X10) for fixing
Outer diameter is 0.2 to 0.4 smaller for mounting