Contains 9 popular sizes:. 1/4 - 28 20 pieces. 1/4 - 28 90 degrees 5 pieces. 1/4 - 28 45 degrees 5 pieces. 1/8 - 27 10 pieces. 1/8 - 27 90 degrees 5 pieces. 1/8 - 27 45 degrees 5 pieces. 6mm - 1 10 pieces. 8mm - 1 5 pieces. 10mm - 1 5 pieces. Convenient re-sealable plastic case.