Great item, excellent price. Not the fanciest out there, but well worth the investment. Bought two and neither had any substantial issues, no damage, no parts missing, etc. There are 12 non-pre-drilled points but they are flexible on location so not too picky. You can get by with a center punch but I used a very small 1/16" drill to put a small starter for each and went very quick and easy. Rails were perfectly aligned without any issues. Make sure you use the reinforcement plastic pieces in order to give stability and strength to the unit. Highly recommend.