"These bolts are FAR bigger then they look in the picture but appear to be very strong indeed. Unlike the WC fixing kit, all items supplied in the packet are used during installation. 14mm drill bit fits it perfectly but seems sensible to drill out with a smaller bit first.
Be careful which spanner you used to screw them in the wall. I used an 8mm which may have been a little too big and it snapped so continued on by using a pipe wrench which worked well. Additional washers would help also as the nut threads do not tighten up far enough on their own to secure the basin."
"The holes in my sink weren't big enough for the M8 screws so I couldn't use this set, but I gave it to a friend and it did the job very well with minimal fuss. I liked the concept of the product and ended up copying the general idea to fit my sink instead of the old brass screws and fibre washers technique as previously used. I used nylon ferrules from the tuning pegs of an old cheapo guitar instead of the plastic flanged nuts, and used stainless steel M6 set screws and T-Nuts to mount the sink to the thick plywood wall that boxes in my pipes."