Feature:1. Cast steel material, provide greater overall strength, durable wear resistant.2. MOD 0.8 gear, while aesthetically unique compared to the larger gears, will operate the same.3. The combo will create a 7:1 ratio, underdrive or overdrive depending on whether you're set out to increase speed or maximize torsion.4. A true maker is about integrating and repurposing, suitable for industrial robot.5. 15-teeth gear, with 6mm round hole, high-hardness, long service life.Specification:Item Type: GearMaterial: Cast SteelProduct Model: S4304-0006-0015Product Specifications: 6mm / 0.24in round hole 0.8 modulus Outer Diameter: Approx. 13.6mm / 0.54inPitch Diameter: Approx. 12mm / 0.47in.Package List:1 x Gear