IF YOU WOULD LIKE TO RETURN YOUR ORDER, PLEASE CONTACT US FIRST.Suitable for Mira, Mira Flight, Daryl Aroco models 816, 891 and 896, SGG Securit, Heritage Unity and many other makes and models.2 rollers supplied from our Warehouse in Cornwall.100% new.FREE UK delivery.Swivel action to also fit curved and quadrant showers.Best seller.PLEASE ENSURE THAT THE FLAT NOTCHES ON THE CAM INSERT ALIGN CORRECTLY WITH THE FLAT RECESSES ON THE NUT WHEN THESE ROLLERS ARE BEING FITTED. WE WILL NOT BE RESPONSIBLE FOR ANY DAMAGED CAUSED IF THESE INSTRUCTIONS ARE NOT CARRIED OUT.Specifications:Wheel diameter: 20mm.Wheel thickness:5.5mm.Diameter of hole in glass: 19mm.Glass thickness: 6mm.