SR59

Supplied as a pack of 4  shower door rollers, uses 304 grade stainless steel   Wheel diameters 20mm x 4mm. (Shown next to a 1p which is 20.4mm) 
These rollers suitable for many different makes are internally threaded, have a 8mm centre which is flush on the front & protrudes approximately 2 mm at the rear,
 Come with replacement M4 stainless steel pan head screws countersunk are available by request.