I recently purchased a second set of rims for my car, a 2009 Kia Cee'd SW (ED). This is a set of steel rims, and as the other one are not, they had a different type of lug nuts than normal.
So the shop I went to had one kind of lug nuts at hand specced for the car, and fitted one wheel, but it looked like in the picture, so I asked to put the old one back for now to have a second opinion. Seemed solid and non-wiggly, but the contacting surface is somewhat smaller than I'd be comfortable with.
Is this safe? Is it even the right lug nut for the rim? The spec was M12/1.5 for the lug nut.