PART #2402-0096 includes 29 sizes 145 pieces five of each size of 1/4"-20 x 1/2" through 2 1/2", 5/16"-18 x 1/2" through 21/2" and 3/8"-16 x 1/2" through 21/2"PART #2402-0097 includes 18 sizes 90 pieces five of each size of 1/4"-20 x 23/4" through 4", 5/16"-18 x 23/4" through 4" and 3/8"-16 x 23/4" through 4"PART #2402-0098 includes seven sizes 35 pieces five each of 7/16"-14 x 1" through 21/2"Custom 450 stainless steel, polished to a mirror finish180,000 psi tensile20% stronger than Grade 8UNJ3A rolled threadsIncludes a 32-compartment labeled trayRefill packs are sold in 5-packs or 10-packsMade in the U.S.A.