[Diameter 23mm]
Set of 8 Butterfly Shower Door Rollers (4 double top and 4double bottom rollers)
Two Screw Distance is :26mm .
Materials: Nylon , nylon wheels, zinc alloy axis - never rust
Wheel Dimensions: 25mm(diameter) by 6mm(thickness).
Set of 8double rollers - 4 top height adjustable and 4 bottom spring loaded