Hobbypower Aluminum M3 Link Rod End Ball Joint CW CCW for 1/10 RC Car Crawler Buggy Black (pack of 20 pcs) Product Name: Ball Joints Fit for M3 stud bolt , Suitable for all 1/10 RC car, truck, buggy, crawler Ball Hole Diameter: 3mm Ring Head Inner Diameter: 5mm Round Head Diameter : 11mm