Professional 12" Rivet Nut Tool Kit with Stroke Adjustment MATERIAL CONSTRUCTION: High-Strength Mandrels: 35CrMo alloy steel with heat treatment Reinforced Handle: Forged high-carbon steel with heat treatment Comfort Grip: Textured PVC overlay COMPLETE SET INCLUDES: ✓ Metric: M3, M4, M5, M6, M8 ✓ SAE: 6-32, 8-32, 10-24, 10-32, 1/4"-20, 5/16"-18 Threaded Insert Nuts (100pcs total): ✓ Metric: M3 (10), M4 (10), M5 (10), M6 (10) M8 (5) ✓ SAE: 6-32 (10), 8-32 (10), 10-24 (10), 10-32 (10) 1/4"-20 (10), 5/16"-18 (5) KEY FEATURES: Stroke adjustment for perfect compression Heat-treated 35CrMo mandrels Forged high-carbon steel handle PROFESSIONAL APPLICATIONS: Automotive, metal fabrication, HVAC, and industrial maintenance