Item Name: Suspension Mill Extension Cord Drill Grinder Flexible Shaft Rubber Hose. Inner Core Diameter: 3.7mm,Chuck Diameter: 8mmGreat for intricate work.Using a flexible drive enables you to take your power tool to the most inaccessible places.It may be used with polishing kits, drill bits, wire brushes, countersinks, flap wheels, mounted - stones and grinding wheels.Fit directly into the chuck of any cordless or electric power drill.Material: Metal, Titanium-plated Spring,RubberColor: Black & GoldLength: 98cmInner Core Diameter: 4mmChuck Diameter: 8mmPackage Includes:1 x FlexibleNote:The color may have different as the difference display, please understand.Please allow 1-3mm error due to hand test. *Please make