Knurled set screws 250-28 x 375L Material AISI 316 510 pcs. Rivet nuts 312-18 UNC-3B Material AISI 430 30 pcs. Helicoil thread inserts 500-20 UNF x 500 Material AISI 304 300 pcs. Helicoil thread inserts 250-20 UNF x 500 Material AISI 304 220 pcs.