Hello, I'm trying to assemble my first ever DIY table. My knowledge regarding screws (or the lack thereof) is causing issues. I'd appreciate any help understanding the following mentions of screw sizes: 1. Screw and washer (10/13 sheetmetal or 10/19 sheetmetal) 2. Nut and bolts (L-12mm x 3/16 ") 3. Screw and washer (L-10/13 sheetmetal) 4. Nut and bolt and washer (L-12 x 3/16 ") What is the method to read these measurements? The installation manual seem to switch between imperial and metric systems which adds further to the confusion. Can someone please help? Cheers!