0.5 modulus brass worm gear set with 5mm hole 40 teeth turbine 6mm screw reducer

1. colour of product may differ slightly, since each computer monitor displays color slightly differently. 2. please allow 1-3cm differs due to manual measurement. thank you for your understanding. 3. 1 inch = 2.54 cm, 1 cm = 0.39 inch 4.dear buyers, we appreciate your business, if you are satisfied with our service,please leave us a postivefeedback and rate the details of the transaction with a "perfect 5 stars".if you have any question, please contact us firstly before you leave feedback and deatailed seller ratings,we can solve the problem peacefully.