STUDCOLLAR-SUPER-O is a stretchy 'O' ring in various colours. The unstretched ring is 15mmID and the wall is 10mm. However, the ring will easily stretch to over 100mmID and exert a lot of pressure. This listing is for THREE rings.

STUDCOLLAR-SUPER-O is a stretchy 'O' ring in various colours. The unstretched ring is 15mmID and the wall is 10mm. However, the ring will easily stretch to over 100mmID and exert a lot of pressure. This listing is for ONE ring.