Rack Module 2 that has already mounting holes machined in the side face. The pitch between the mounting holes is 120mm. The lengths we have in stock are about 2000mm, the exact length is 2004mm. This is the number of Teeth(319) multiplied by the module (2) multiplied by Pi (3,14etc), gives a result of 2004,336mm. In reality its cut a litle but shorter to 2004, this allows a small gap required for continous linking. In the webshop, you can also choose to order a different length, we then cut it to size for you.