These are as basic as it gets. Really wouldn't bother buying these.
Fixing is achieved by a set of 8 self adhesive pads, about the size of a 1p coin, per speaker coupled together to make a male & female velcro combo.
Initially all was fine but within 24hrs a grill would fall to the floor. This happened on both speakers time and time again. Ended up holding them in place with superglue.
That all said they look very nice once they are on, just a shame they got damaged by falling so often.