NUT Cockring : 
S/Steel,
Multi Sided
Need to add some power to your tool? The answer is simple and effective:
A cock ring.But not just any cockring. Get the solid stainless steel Bolt. This architecturally-inspired gem is uniquely sized. The blood flows into your dick but is restricted from leaving you with a thicker, harder, longer and more sensitive cock
 
SIZES AVAILABLE: 
Round Edges: 15 mm x 6 mm x 50 mm
Round Edges: 15mm x 6mm x 40mm
Round Edges: 15 mm x 6 mm x 55 mm