Lock, padlock, bolt -stainless steel o-ring, o-ring Highlights generic brand stainless steel o-ring, o-ring Description: Round seamless o-ring. Not to lift. 304 stainless steel materials Multiple sizes to choose from. Highly polished for an elegant appearance. Size Chart: 3*25mm/0.12*0.98in (Thickness*Inner Diameter) 4*30mm/0.16*1.18in (Thickness*Inner Diameter) 4*40mm/0.16*1.57in (Thickness *Inner Diameter) 5*30mm/0.2*1.18inch (Thickness*Inner Diameter) 5*40mm/0.2*1.57inch (Thickness*Inner Diameter) 5*50mm/0.2*1.97inch (Thickness*Inner Diameter) 6*30mm/ 0.24*1.18inch (Thickness*Inner Diameter) 6*40mm/0.24*1.57inch (Thickness*Inner Diameter) 6*50mm/0.24*1.97inch (Thickness*Inner Diameter) 8*40mm/0.31*1.57inch (Thickness*Inner Diameter) 8*50mm/0.31*1.97in (Thickness*Inner Diameter) 9*50mm/0.35*1.97in (Thickness*Inner Diameter) Package includes: 1 piece O-ring Seamless Stainless Steel (4-Pack) Note: 0.1mm-2mm measurement error exists, especially from different batches.