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