I have this kind of anchors (plugs): rawlplug uno
Despite googling hard, I couldn't understand what type of screws they should go with: wood screws? sheet metal screws? machine screws? coarse thread? fine thread?
Every source seems to only specify the diameter and length of the screw to use with a particular size of the plug, nothing else!
Also, if there is any other feature of a screw relevant to their coupling with a given anchor, I'd be interested to hear about that.