a 10mm ralwbolt goes into a 16mm drilled hole,10mm is the thread size of the bolt and 17mm the spanner size of the nut and I very much doudt that you will get "a Rawlbolt" at the bucket DIY shops the last time I bought any they only sold cheapo plated exanding bolts that are crap, I can post you the genuine thing, if you admit that my TS is way better than yours.
CLEM