Scope of application: for 1/10 RC Car Crawler SCX10 D90 Fine workmanship: fine workmanship, looks very beautiful. Easy to use,Easy to replace Axle Hole diameter: 5.5mm Hex Size: 12mm Inner Diameter of the Nail: Compatible with: for RC 1/10 Crawler Car Axial SCX10 90046 90047 D90 Extension: 12mm Color: Red Material:Metal Package Contents: 1x for RC Car Upgrade Parts kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin