I bought this item because my big toe on one foot has a pin from a past operation and I need to use the pop in stretch plugs (those small black plastic bump things) to stretch out my dress shoes where the pin is.
The holes are 7/64ths and the plugs are 13/64ths. There is no way, short of being Hulk Hogan, that you are going to get those plugs in.
Luckily I own a woodworking shop and so I just drilled out the holes to fit; but come on.....who was in charge of making sure they fit when these were designed....Daffy Duck?
On the PLUS side, otherwise they seem of fairly good design and quailty. So if you don't own a dril and a set of bits, and won't be using the pop in's, then get them.