Armstrong 66-843 7 Piece Solid Handle, Hollow Shaft Nutdriver Set SAE Full Hollow Shafts Facilitate Work with Long Bolt & Stud Applications Shaft is Precision Formed From High Alloy Steel Using the Most Up-To-Date Manufacturing Process and Heat Treat for Precise Fully Color Coded Sae Handles (Handle & End) for Easy Size Identification Fully Polished Chrome Plated Shaft Provides A High Luster That Prevents Corrosion