ITEM NAME:5mm Rigid Flange Coupling Guide Shaft Coupler Motor Connector Joint Set 5mm Rigid Flange Coupling Guide Shaft Coupler Motor Connector Joint Set Description: Brand new and high quality Made from 45# steel, hardened by heat treatment, and then electroplated Parts for RC Airplane Boat ,DIY Model. Perfect accessories for RC Model motor, etc. Material: Iron Size Chart: 4mm/5mm/6mm Inner Diameter: 4mm/5mm/6mm Cylindrical Diameter: 10mm Cylinder Height: 10mm Overall Height: 12mm Fixed Hole Screw: M3 Fixed Hole Distance:16mm 8mm Inner Diameter: 8mm Cylindrical Diameter: 16mm Cylinder Height: 10mm Overall Height: 13mm Fixed Hole Screw: M4 Fixed Hole Distance: 24mm Package Includes: 1 Set Flange Coupling Note: Please allow a little size error due to manual measurement. Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the item's color may be slightly different from the pictures. Please understand..1 Set Flange Coupling. Fixed Hole Screw: M3. Fixed Hole Screw: M4. Fixed Hole Distance:16mm. Fixed Hole Distance: 24mm. Perfect accessories for RC Model motor, etc. Parts for RC Airplane Boat ,DIY Model.