I have some trouble in draft feature. First, I made two concentric holes as diameter mentioned in the figure. Then I wanted to make draft feature in the common surface shared by those 2 holes. But I couldn't fix it up.
If want a draft in the surface you have mentioned,u can try out chamfer feature or you can go for a revolve feature to create an inclined surface with 15 degree angle,
Hope u understood what i mean to say,if u dont understand,please do reply me.