More effective cleaning process - cleaning solution can easily reach and drain from both the i.d. and o.d.
Less risk for air pockets - Bends can cause air pockets which prevent cleaning and plating solution from reaching all surfaces. Extra care must be taken to ensure a quality finish.
Cost-Effective - Parts can be plated easier and more efficiently reaching both i.d. and o.d. with standard plating methods, resulting in a lower cost to customers.
Lower Shipping Cost - Straight parts can be packed more densely resulting in lower shipping charges.