Item Type: Gear Material: Cast Steel Product Model: S4304-0006-0030 Product Specifications: 6mm / 0.24in round hole 0.8 modulus Outer Diameter: Approx. 25.6mm / 1.01in Pitch Diameter: Approx. 24mm / 0.94in 1Cast steel material, provide greater overall strength (as compared to brass or aluminum), a true maker is about integrating and repurposing. 2This 30 tooth MOD 0.8 gear will mate with any MOD 0.8 gear, simple installation and use. 3When building on pattern, the most common partners for this gear are another 30 tooth gear, or a 90 tooth hub gear. 4Utilizing a second 30 tooth gear will create a compact 1:1 ratio on a 24mm center distance. 5Mating with a 90 tooth hub gear will create a 3:1 ratio on 48mm centers and can be used as an overdrive or underdrive.1 x Gear