These are the M6 bolts needed to add/remove risers from the Felt Bayonet 3 risers found on most Felt triathlon bikes. Each kit has 4 bolts of each size:
4x 15mm
4x 20mm
4x 25mm
4x 30mm
4x 35mm
(20 bolts total)
Use this guide to determine which spacers/bolts/support bridge you may need.