3M Hookit Soft Interface Pad, 150 mm x 5 mm, Multihole, Soft, 51126 Soft Interface Pad 150mm x 5mm, 2 Pack 203348 by Festool 3M Hookit Soft Interface Pad, 150 mm x 10 mm, Multihole, Soft, 51127 3M 75mm Soft Interface Pad (3 inch) 3M Hookit Soft Interface Pad 3M. 3M 20278 5" 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.