HE - OG Enail Insert Titanium Nail 16mm Ht.
This is the replacement nail that came with the original Highly Educated E-nail units. This nail fits coils with an inside diameter of 16mm (0.625") and a maximum coil height of 16mm. Two separate pieces assemble to hold the coil safely in place. The OG E-nail insert is to be used with any standard tapered 18mm & 14mm female glass on glass ground joints.