The Lindapter 'AFW' Adapter Washer is used to fill the recess on the 'AF' High Friction Clamp. Additionally, it features two projections which, when the 'AFW' is inverted, will captivate the larger hexagons of 10.9 bolts (M12-M20 only). Lindapter 'AFW' Adapter Washers have a hot dip galvanized finish and come in multiple sizes.