It is for use in either the Siamese Arisaka (Type 66 rifle) or Mauser (Type 45). It can be formed into the Type 45 (8 x 50R) brass if needed but rifles for this round are much less common. These rifles use a standard 8mm bullet. Type 66 bullet is a spitzer and the earlier Type 45 used a roundnose bullet. This brass is packaged in lots of 20. Shipping weight is 260 g/20 cases.