Use quality kibble as may source of feed for my two dogs.However thinking of introducing bones into there diet.Which ones are both safe and good in nutritional value to use.Thanks.

Chicken/turkey necks/carcasses sound like just what you need.  They are the best all round nutritionally, and necks/carcasses are less likely to be swallowed whole than wings/drumsticks, although you should keep an eye on your dog's for the first few times you feed them raw bones to make sure they've got the right idea. 

Lamb ribs and bones are also great, as beef bones sometimes cause upset tummies.

please remember to feed them raw and not cooked.