The hole in there is a bit small. With the amount of flowing water, however, it does not depend on the diameter of the hole, it depends solely on the water pressure, with normal water pressure, which almost everyone i, d, r has in the house, just as much water comes out as everyone other wall bracket. A small hole is just not ideal for low pressure, but most homes are typically normal high pressure. if you buy several items, 2 or 10, no matter how many, then you ONLY pay shipping for package once. we charge for the shipping what the shipping actually costs. If all ordered items are not automatically combined after purchase and shipping is calculated once or incorrect costs are calculated, then write us a short email, we will do the calculation manually for you with one-time shipping, and s.