<p>A choice of ball caster kits with either a 3/4in or a 1/2in diameter metal ball. The kit includes a black ABS housing, a 3/4in or 1/2in diameter metal ball, two spacers, and two #2 screw sets. The total height of the ball caster can be increased by using the included spacers.<br/><br/>
These ball casters are just two of the many <b>Pololu</b> accessories carried by <b>Rapid</b>.<br/><br/>
For further resources please see <a href="http://www.pololu.com/product/955">here</a> and <a href="http://www.pololu.com/product/953">here</a>.</p>
Two included #2 screws used to mount ball caster to chassis
Distance between screw holes 0.61in/0.58in
Note: The ball casters are designed for small robots and are not intended to bear more than a few pounds. With more weight than this, friction between the ball and the housing will probably keep it from rolling well.