Compatible with aggressive boots like K2 boots Fatty Pro and Varsity. Uses the same screw holes as UFS, but will not fit if the plate has round anti-slip protrusions. Old K2 boots, with scratches and scuffs (see photos). Will fit Fatty Pro and Varsity frames and soles. For those who have them, how about it? Please bid if you understand that this is a used item. Please ask any questions you may have. Thank you for viewing.