Delrin Via Slide Bearing
Two ball bearing 5mm inner bore.
CNC Machined Delrin or POM part.
All metal stainless steel slide bearing W type DelrinW is available price at 2.5USD/pc.
More roller bearing W1 or W2 please refer to
http://www.robotdigg.com/product/458
http://www.robotdigg.com/product/459