D - Protruding boss height : 19mm is 5.8mm. 23mm, 25mm and 27mm is 4.5mm. B - Wheel thickness: 6mm (5mm for 19mm wheel only). Shower Part Ltd. 4 wheels supplieddirect from our Offices in Cornwall United Kingdom.

Wheel Diameter: 23mm
Type: Shower door rollers
Features: Shower Door Rollers
MPN: A3
Manufacturer: Suitable for many shower types
Number of Items in Set: 4 wheels
Room: Bathroom/Shower Room
Brand: Shower Part
Suitable For: Bathroom, Shower Room, Shower Door, Shower