This Hi-Tech Backing Plate … This pad has eight vacuum holes and is 5 … It features a foam body attached to a hard plastic backing plate. Including Porter Cable, Meguiars, Griots FLEXIBLE URETHANE BACKING is lightweight and flexible and improves operation smoothness. Quick and easy sanding disc changes with hook and loop attachment … You *could* use 5 … It also has a sturdy hook and loop style bottom for use with hook and loop sandpaper. 5" flexible sanding backing plate, ideal for all brands of dual action polishing machines, random orbital with 5/16" thread. It also has holes for those sanders where you can attach a vacuum hose. Use the 3M Hook-It 5 Inch Dual Action Backing Plate with 6 inch pads for optimum performance. Allows quick and easy pad changes with Hook & Loop fasteners Industrial grade hooks and loops hold pads securely during polisher operation The backing plate fits any dual action polisher that accepts a 5/16” thread. Tolerates speeds up to 12000 RPM To be use with 6.5 inch or 5.5 inch … Trust 3M's expertise to bring you an excellent backing plate … The 5" size is correct but according to the description of Model 7345, it uses ADHESIVE backed pad and no dust holes. With Universal Thread 5/16"-24. This one has hook and loop (Velcro) and is not adhesive backed. The 5 in. 5 Inch DA Polisher Backing Plate. Designed for Dual Action Polishers . The backing plate is lightweight, shock resistant, and well-balanced to give you a flawless finish. Round Hook and Loop Backing Pad is a replacement pad for the Makita BO5030/K, BO5031K and BO5041K orbital sanders.