3M Xtract Interface Disc Pad 28323, 5 in x 1 2 in x 3 4 in 31 Holes 3m 28322 6 Soft Interface Pad 3M Hookit Interface Pad 28845, 3 in x 4 in Haus of Tools 3M Soft Interface Disc Pad 3M United States 3M Hookit Soft Interface Pad, 150 mm, 25 hole, 05777 3M. 3M 28322 6" Soft Interface Pad Soft Interface Pad (to be inserted in between the backing plate and the pad), increases conformability, allowing the technician to follow contours and get in closer to most edges. Constructed of a soft durable foam. Also enables a more versatile uses with specific and more rigid pads, such as Rupes MF pads.