Alcatraz Digger 12 35 B30 -15 ( 16 C ) ( Cage only )

Alcatraz Digger 12 35 B30 -15 ( 16 C ).
Only to be used with a ring size above 54 mm in diameter.

Based on a 12 35 cage ( tunnel 12 mm and diameter 35 mm internally, at the base 30 mm ). Space for 16 spikes.
Tunnel inverted 15 mm