Metric hardware included.
Low Profile Seat Reinforcement Washer Set
3.5mm thick (20% less than a conical)
Large 60mm O.D. Flat Surface (no painful pressure point)
Reinforces the Seat (reduces cross-hole cracking)
Inner & Outer Washer, plus Spacer, plus M5/M8 Installation Kit
Kit includes material to reinforce ONE mounting hole.