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Step size

RadSlider's properties - LargeChange and SmallChange allow you to define the amount of value that will be used as a step-size. Setting LargeChange, for example, will control how much the thumb will travel when the track is clicked.

<telerik:RadSlider LargeChange="2" Maximum="10" /> 

WPF RadSlider Large Change

SmallChange on the other hand is used when RadSlider has its handles visible. Clicking any of the handles will increase/decrease the value by the amount specified in SmallChange.

<telerik:RadSlider SmallChange="1" HandlesVisibility="Visible" Maximum="10" /> 

WPF RadSlider Small Change

The same applies for the thumbs when the RadSlider is in selection range mode.

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