plastic tunnel boring machines for sliding block pack of 10Plastic tunnel boring machines for orthonyxia with sliding block technique Essential in the production of active titanium resin equipment, facilitating the movement of the titanium in the tunnel. To avoid breakage of the tunnel boring machine, we advise you to gently pull on it to remove it from the stud, or even put a little grease on its end so that it comes out even more easily. Bag of 10