The diameter is suitable, it makes nice big loops and the coating makes hair shine without seeming too the damage I LOVE! It heats in 20 seconds, no need to make white hair ;-) only negative, adjustment is via a dial without graduation so the adjustment is somewhat at random haha! other than that, the design is modern and attractive it lacks a hook (personally, I hang my irons / hair dryer on the wall), in general, all curling irons have but not this one For the price, I really recommend is a good quality product !!!