Range of 0.25" to 2.25". Fits a very wide range of caliper designs and thin rotor designs. One tool for Motorcycle and other recreation vehicles, as well as automotive applications. Compresses brake caliper pistons without damaging new pads This caliper spreader allows the caliper pistons to be depressed so the new brake pads loaded in the caliper will slide back over the new or used brake rotor. This is required since the new pads have a significantly increased width compared to the old, worn out pads. This spreader works on applications with rotors as thin as 0.25", commonly found on motorcycle, ATV, snowmobile, and other recreational vehicles. Can also be used on automotive applications.