Premium Quality: 10-24 mandrels are made of high-hardness carbon steel to maximize wear and tear; you don't need to worry about breakage and the short service life of the accessories Easy Replacement: The accessories we provide have been through strict testing, which perfectly fit the size and weight you need, saving time and effort on retrofitting and replacing Sturdy & Durable: You will get 2 mandrel . Rivet nuts are made of thick carbon steel, which is treated with high-temp machining to prevent corrosion and increase durability Save money and replace nut rivet mandrel instead of buying a new riveter,Fits many standard nut riveters. Comprehensive Service: We are confident in our products. If you find any problem with the product, please let us know in time to replenish the goods. Wish you happy shopping