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STUD BOY'S POWER TOWER LOCK-NUTS WITH NYLON INSERTS - 1/2" - 5/16" (24 Threads) - To be used with 1.080" and 1.87" studs. - 6061 / T6 aluminum for greater strength and support. Recommended to be used with: - Stud Boy "Power Point Plus" Stud: 1.375"