Item Descriptions:-Motor Shaft Adapter for 4mm dia shaft and 6mm dia hole propeller, excellent model plane parts.-Apply for brush motors and speed controllers.-Installation tip: 1. Remove the propeller clamp, put the bottom threaded part on the motor shaft, next, put on the middle part, pay attention to the side with the anti-slip pattern facing outward. 2. Put the propeller up, screw on the last part, insert the steel wire into the small hole of the last part, and tighten it clockwise.-Made of high quality aluminum, it is durable to use.-Please choose the appropriate size according to your motor shaft diameter.Package:4x Propeller AdapterItem Specifications:Type:Propeller AdapterMaterial:AluminiumMotor axle hole diameter:4mm/0.16inchOutput axle diameter:6mm/0.24inchColour:Silver