Professional Extension Mandrels for Long Rivet Nuts - Complete Solution for Extended Fasteners Upgrade your rivet nut tool with our high-quality extension mandrels, specifically engineered to install long rivet nuts (including lantern-type rivet nuts) that standard mandrels cannot accommodate. Crafted from durable 35CrMo alloy steel with precision machining, these mandrels meet OEM specifications for reliable performance in demanding applications. Key Features and Benefits Superior Compatibility Designed to fit most popular rivet nut guns including BT607, BT606, and CORWIN 1003 models, ensuring broad usability across different tool brands. Comprehensive Size Selection The set includes both metric and SAE sizes: M5, M6, M8, M10, 10-24, 10-32, 1/4-20, 5/16-18, and 3/8-16, covering virtually all common rivet nut applications. Intelligent Organization System Each mandrel is housed in its own clearly labeled plastic case with color-coded identification for instant size recognition and protection against moisture and damage. Enhanced Durability Manufactured from hardened 35CrMo steel using the same processes as original equipment mandrels, these extensions withstand heavy use in automotive, HVAC, and industrial environments. Usage Guidelines For optimal performance and safety, immediately cease applying force once the rivet nut is properly set. Excessive force provides no additional retention benefits and may damage tools. Always verify mandrel compatibility with your specific rivet nut gun model before purchase and use. Store mandrels in their protective cases when not in use to prevent loss and maintain condition. Package Contents Nine precision extension mandrels (covering both metric and SAE sizes) Nine individual protective storage cases Material certification available upon request Ideal Applications Automotive repair and maintenance HVAC system installation Metal fabrication projects Industrial equipment assembly General construction tasks This professional-grade set solves the common frustration of being unable to install long rivet nuts with standard tools. The organized storage system and color-coding prevent mix-ups while the durable construction ensures long service life. For mechanics, technicians, and serious DIYers who demand reliable solutions for challenging fastening jobs, these extension mandrels provide the perfect answer to difficult rivet nut installations. Upgrade your toolkit with this essential specialty accessory today.