Chemical Guys BUFLC_BP_DA_6 Dual-Action Hook and Loop Molded Urethane Flexible Backing Plate (6 Inch) DA backing plate actually measures 5-3/4 inch; Pro-FLEX flexible backing plate ideal for all DA machines, porter cable, ultimate detailing machines and several others The best backing plate for 6 inch pads for use with all Lake Country Pads, Chemical Guys MPT pads and all other Hook-and-Loop style pads; this backing plate was specially engineered by Chemical Guys to fit perfectly Backing plates minimize heat transfer, while flexing just enough to contour to your car's curves Dual-Action flexible backing plate provides the safest, most durable surface for your pads so that you get the performance possible from your Dual-Action polisher Urethane is flexible and very durable; reinforced inner construction utilizes steel struts molded into the center hub to give the plate stability while maintaining a great even surface for pads