These do not fit the standard Wilton Coupler but truthfully I do not use this often. I usually put the tip inside the bag and cut the tip off. There is a coupler you can get to use with these tips but I do not have one at this point.
I love these tips. There are more different tips that I will be adding to this set. I have found a great Tutorial on using these tips.
I used only one tip with this cake. I will be using the others in the future and learning different techniques.