Simple construction is a drawback for this. The seat and the back are held together with four 1/4 inch bolts. 8 bolts total. There is no notch or ledge to hold the weight, it's all held by the 4 bolts. It's a lot of expectations out of a 1/4 inch bolt. The bolts are Allen wrench and they are flat head. One nice feature is the nuts are welded on so you don't have to deal with that and that's a big plus. It's good solid material and looks very nice. It's simple instructions and only 8 bolts but it's a bit of a struggle with the supplied Allen wrench. I should have used a screw gun with an Allen tip. Too bad they didn't use 3/8 or half inch bolts with a ledge/bracket. Overall I am happy but it could be a better price.