ITEM NAME:Coupling Metal Cardan Joint Universal joint U-joint Motor Fitting Part 2x4mm Description: - 5Pcs Metal Cardan Joint Gimbal Couplings Universal Joint Connector Model DIY Motor Shaft Fitting Accessory for RC Car Crawler Buggy Boat - Perfect accessories for RC Model motor, such as model airplane boat - Made of stainless steel, durable - 360 degree rotatable universal joint - Material: Metal - Color: Silver Size Chart: 2x2mm: M3 OD: 8mm L: 18mm 3.17x3.17mm: M3 OD: 9mm L: 23mm 4x5mm: M4 OD: 11mm L: 23mm 3x3.17mm: M3 OD: 9mm L: 23mm 2.3x3mm: M3 OD: 9mm L: 23mm 2x4mm: M3 OD: 9mm L: 23mm 2.3x2.3mm: M3 OD: 8mm L: 18mm Package Included: 5 Pieces Universal Joint Coupling 1 Piece Wrench 2 Pieces Screws.2x4mm: M3 OD: 9mm L: 23mm. 5 Pieces Universal Joint Coupling. - 360 degree rotatable universal joint. - Perfect accessories for RC Model motor, such as model airplane boat. - Made of stainless steel, durable.