Ive assembled countless items over the years along with cars and other electronics. Immediate assembly of this item produced trash bolts. One set immediately stripped when i got to the first turn of tension. The others looked cheap like the one set that stripped. The item itself looks fine. Vevor i have had luck with other items like their rolling seat etc... i just recommend grade 8 bolts. Ive replaced mine. Not to mention this is a spring compressor i rather not have the weak point be bolts. Granted im sure they are strong enough to hold but at this point i went on and replaced.