Specifications
Material:Metal
Color:Black
Material: 45# just made, blackened and hardened

Parameters: 0.8 modulus 32P / inner diameter 5MM (with machine screw)
T number parameters

13T 13T ¢5*¢11.907*14mm 
14T 14T ¢5*¢12.701*14mm 
15T 15T ¢5*¢13.495*14mm 
16T 16T ¢5*¢14.288*14mm 
17T 17T ¢5*¢15.082*14mm 
18T 18T ¢5*¢15.876*14mm 
19T 19T ¢5*¢16.67*14mm 
20T 20T ¢5*¢17.464*14mm 
21T 21T ¢5*¢18.257*14mm

Package includes:
1 * Black steel metal Gear

Notes:
1.Please allow 1-3mm error due to manual measurement. Thank you for your understanding.
2.The display calibration is inconsistent. The color of the object shown in the photo may be slightly different from the real object. Refer to the actual product.