property Slider.ThumbSize as Long
Specifies the width or the height of the thumb.

TypeDescription
Long A long expression that defines the size of the control's thumb.
By default, the ThumbSize property is -1. If the ThumbSize property is -1, the control automatically computes its size based on Maximum, Minimum, LargeChange and related properties. If the ThumbSize property is greater than 0, it indicates in pixels the size of the thumb. Use the Orientation property to specify whether the control is vertically or horizontally oriented.