With plastic flexible body, light weight and easy to install in all directions and anglesWidely used for lathe, milling, CNC machine, hydraulic machines and water coolingRound nozzle inner diameter: approx . 0.1 inch / 0.3 cmThread Outer Diameter: Approx. 1/2 inch / 12.5 mmProduct Name: Coolant Hose; material: plasticDue to manual measurement, there will be some errors.Plastic Flexible Water Oil Coolant Pipe Hose Round Nozzle. Feature: 1) Light Weight and Easy to Install with Any Direction and Angle. 2) Good Pipes Used to Make a Third Hand. 3) Just the Thing to Direct Coolant to Cutter Tips on Lathe & Milling Machines. 4) Stable Characteristics High Reliability. 5) Used to Make an Extremely Useful inhelping Handin when Crocodile Clips Attached. 6) Brilliant for That but No Idea About Their Designed Use.