Specifications: Made of solid alloy for durability; good performance. Ideal for rigid shaft motors for model cars, model boats, robots and other types of metal transfer; widely used in metal, die and mechanical drive applications. Type: Motor Shaft Coupler Material: Alloy color: Features of Random Colors: Durable, easy installation, good replacement 2-2/3-3/3.17-3.17mm Length: 2cm/0.79"", Diameter: 1.2cm/0.47"" (approx.) 4-4/ 5-5mm Length: 2.5cm/0.98"", Diameter: 1.4cm/0.55"" (approx.) 6-6/8-8mm Length: 2.5cm/0.98"", Diameter: 1.6cm/0.63"" (Approx.) Note: Products will be shipped in random color. Due to the different light and screen settings, the colors of the items may vary slightly from the images. Please allow slight size differences due to different manual measurement. The package includes: 1 x Motor Shaft Coupler 1 x Wrench 4 x Screws