For the Vintage Sniper Class competitor putting together a USMC sniper rifle from a 1903 Springfield. These case colored scope bases are for use with Unertl/Posa or Unertl type scope mounts. These are .100" taller bases than the SME003 to help with bolt clearance especially on bolts that have not been altered for scope use. Rear base is .335" high and front, .575". The squared ends of the bases are the same shape that was shipped with the USMC Unertl sniper scope to the US government. Case Color finish, mounting screws inlcuded.