The Razor Cult UFS Frame Mounting Bolts Kit contain round washers T-Nuts and screw bolts needed to attach a pair of UFS frames to the Razors Cult Skates.  They are more specific to the Razors Cult as the back mounting bolt is much longer than most mounting bolts (for use in the heel).
 
The round washer looking things are preferred for replacement as they ensure a full secure "lock" due to the small protrusions that will "catch" onto the base of the shell when tightening the bolts into place. The kit includes  hardware to mount a pair of frames.