LA BLINGZSterling Silver Satin Lion Head DC Leo Pendant (S/L)

So how would i go about you all putting a 4.5 or 5mm on it. and like i said i have a 4 mm chain. which would you think is best fit?

Is this 925 sterling silver?

What are the dimensions of the pendant?

Will this large charm fit an 8mm cuban link chain?