The main problem is that this product is NOT compatible with Porter Wire Table Saw. Porter cable with a hole diameter of 9.54mm and this product of 12mm. So unless you have already made the wrong decision like I have, do not purchase this product if you have a Porter Cable table saw. I recommend buying original gears. It will cost more but they guarantee it will work. Side question, my gears arrived two days later already rusted. I have no idea where they were stored or how long they were made.