One-Way Rotation Gear Set,Thick Transparent Ratchet Pawl Mechanism DIY Kit for School Science Projects

High-concerned chemical：None isCustomized：Yes Pressure Angle：/ Standard or Nonstandard：Nonstandard Processing：Hobbing Model Number：0215PK Tooth Profile：Spur Gear Material：Plastic Shape：Cylindrical Gear Origin：Mainland China Certification：NONE

High-concerned chemical: None isCustomized: Yes Pressure Angle: / Standard or Nonstandard: Nonstandard Processing: Hobbing Model Number: 0215PK Tooth Profile: Spur Gear Material: Plastic Shape: Cylindrical Gear Origin: Mainland China Certification: NONE