The RUPES Nano iBrid Backing Plate is designed to be used exclusively with the RUPES HR81ML BigFoot Nano iBrid and is currently available in two different sizes, with each size being compatible with a set range of Nano iBrid foam polishing pads and Nano iBrid wool polishing pads (see the fitting notes in the How To Use section below). Although the 30 mm version is made out of powder-coated steel and the 50 mm version is made out of moulded nylon, both are engineered to meet a specific weight target, which ensures that they work in harmony with all three functional units supplied with the RUPES HR81ML BigFoot Nano iBrid. This approach, which is also used for the Nano iBrid polishing pads, ensures that the machine is optimally balanced during use and that vibration levels are minimised. Both sizes also feature the same durable hook and loop fastening material, which is specifically designed to be able to withstand the extreme lateral forces generated by the 12 mm random orbital functional unit, and provide solid anchoring and exceptional stability while the machine is in use. The amount of vertical grip, however, is normal, thus ensuring that Nano iBrid polishing pads remain easy to affix and remove.