These attack speed runes are very effective on xin zhao, cause his ability "Battle Cry" has an passive and active who give xin zhao nice attack speed. His passive skill is when he hit three times he regen some hp and with this attack speed he'll regen very fast and plus items with life steal this will be great!

These items i have chosen is really good for xin zhao. This attack speed at level 18 with this items is about 2,300 ats witch give you alot of health steal.