The thorns them-self have an inner diameter of about 1 inch;
The diameter of ring with thorns is about 1.57 inch;
The default size of base ring with lock is about 2.0 inch.
One brass padlock with keys is included.
S: 4 CM/1.6 INCH
M: 4.5 CM/1.8 INCH
L: 5 CM/2.0 INCH