uxcell Die Stock Handle Wrench Set, 1 2 28 UNEF Threading Die and 38mm (1 1 2") Holder (Fits: 26mm 38mm OD M12 M16 Round Dies) Adjustable for Bolt Thread Repair auspowers_batchone you can replace the defective inculd screw and tool you can replace the defective product or return it for a refund within 30 days DERNORD manufacturers its 2 piece ball valves with all stainless steel parts so you can be sure there won't be any rust formation from external air or water exposure over time with 5 adjustable screws Round Die: 1 2 28 UNEF threading die with 38mm outside diameter The die surface is lubricated with grease to prevent rust