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23T 4 mm output equipment Hole diameter: 4 mm Gear thickness: 3 mm; Product description Small module equipment is used for toy accessories, mini cars, remote control planes, etc. How to calculate the calculation of equipment? (For reference only) Transmission module M = outer diameter ÷ (number of teeth +2). Outer diameter = gear module × (number of teeth +2); Product description Small module equipment is used for toy accessories, mini cars, remote control planes, etc. How to calculate the calculation of equipment? (For reference only) Transmission module M = outer diameter ÷ (number of teeth +2). Outer diameter = gear module × (number of teeth +2); Small module equipment is used for toy accessories, mini cars, remote control planes, etc. How to calculate the calculation of equipment? (For reference only) Transmission module M = outer diameter ÷ (number of teeth +2). Outer diameter = gear module × (number of teeth +2)