2mm/2.3mm/3mm/3.175mm/4mm/5mm/6mm/8mm Rc Boat Car Metal Cardan Joint Gimbal Couplings Shaft Motor Connector Brand New with high qualityMaterial: Iron 45 steel (fine electroplating)Color:SilverStyle:21 stylesQuantity:1pc universal joint + machine screwStyle:Style 1:8mm to 8mmStyle 2:6mm to 8mmStyle 3:5mm to 8mmStyle 4:6mm to 6mmStyle 5:5mm to 6mmStyle 6:4mm to 6mmStyle 7:5mm to 5mmStyle 8:4mm to 5mmStyle 9:3mm to 5mmStyle 10:4mm to 4mmStyle 11:3mm to 4mmStyle 12:2.3mm to 4mmStyle 13:3.17mm to 4mmStyle 14:3.17mm to 3mmStyle 15:3mm to 3mmStyle 16:2.3mm to 3mmStyle 19:2mm to 2mmStyle 20:2mm to 3mmStyle 21:2mm to 4mmProduct outer diameter and length introduction:2.3 turn 2.3mm, 2 turn 2.3mm, 2 turn 2mm outer diameter 8mm, length 18mm,The weight is about 8 grams, and the side fixing holes are M3.3 turns 3.17mm, 3.17 turns 3.17mm, 2.3 turns 3mm, 3 turns 3mm, the outer diameter is 9mm and the length is 23mmThe weight is about 8 grams, and the side fixing holes are M3.3.175 turns 4mm, 3 turns 4mm, 4 turns 4mm, 2.3 turns 4mm, outer diameter 9mm, length 23mm,The weight is about 7.5 grams, and the side fixing holes are M3.4 turns 5mm, 3 turns 5mm, 5 turns 5mm, 4 turns 6mm, 5 turns 6mm, 6 turns 6mm outer diameter 11mm, length 23mm,The weight is about 10 grams, and the side fixing holes are M4.5 turns 8mm, 6 turns 8mm, 8 turns 8 mm, the outer diameter is 14mm, the length is 35mm, the weight is about 20 grams, and the side fixing holes are M4.8 turns 10mm, 10 turns 10mm, the outer diameter is 16mm, the length is 35mm, the weight is about 28 grams, and the side fixing holes are M4.Package Include1pc universal joint + machine screwNotice:1.1cm=10mm=0.39inch.2.Please allow 1-2mm error due to manual measurement and make sure you do not mind before ordering.3.Please understand that colors may exist chromatic aberration as the different placement of pictures.