60pcs Unified USA 304 Stainless steel Helicoil Thread Repair Insert Assortment Kit 60pcs Unified USA 304 stainless steel Helical Thread Repair Insert Assortment Kit Stainless steel inserts are 50% stronger than the original thread. Kit Includes: 2-56 x 1.5D (6pcs), 4 - 40x1.5D (6pcs), 6-32 x 1.5D (6pcs), 8-32 x 1.5D (6pcs), 10-24 x 1.5D (6pcs), 10-32 x 1.5D (6pcs), 1/4-20 x 1.5D (6pcs), 1/4-28 x 1.5D (6pcs), 5/16-18 x 1.5D (6pcs), 3/8-16 x 1.5D (6pcs).