See to wear and use its strength but for the price we will not complain. I regret just a note about 6 rooms called "3 special bolts M12 x 1,5 * 3 special bolts M14 x 1.5" was impossible to know what to use them but I can find with those who have already bought .
EDIT: I just found it's actually to screw on the integrated hub to be able to remove the hub, it's stupid but I had not thought of on the spot ...