Mettec manufactures two different strength bead lock bolts. Mettec T4 are rated to Min UTS 140,000psi (Stronger than Grade 5 Steel Bolt) and Mettec T6 is rated to Min UTS 160,000psi (Stronger than Grade 8 Steel Bolt). Both have forged heads and rolled threads for increased fatigue strength. Kit contains the following P/N's 16ea T4NC03121250 Titanium 6/4, 5/16-18 x 1-1/4" at Min UTS 140,000psi 16ea AN960-516L Steel Thin Washer .032" Thick