Specifications: Industrial grade stainless steel CNC Machined -Joint for super operation High operating angle Direct fit, no modification needed Fits 1/14 RC Tractor Truck! Specifications: Universal Joint Diameter: 9.8mm Shaft Body Diameter: 7.8mm Internal Shaft Siamete: 3.7mm Hole size: 4.8mm How to measure which shaft is for your project: 1.Measure the diameter of your output shafts on the tranny and input shafts on the axles to see if they are 4 or 5mm. 2.Measure from output shaft to input shaft to get the correct measurement of your total length needed. Specification: 50-62mm Color: Silver Material: Stainless steel Package Contents: 1 x Drive Shaft for RC car 2 Set Screw for RC car 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.