Ring Size Guide Note: to ensure that you get an accurate ring size from this guide, please read the following instructions caref
![O-Ring, Black BUNA/NBR Nitrile Size: 390, Durometer: 70 Nominal Dimensions: Inner Diameter: 20 85/89(20.955) Inches (53.2257Cm), Outer Diameter: 21 3/8(21.375) Inches (54.2925Cm), Cross Section: 17/81(0.21) Inches (5.33mm) Part Number: ORBN390 O-Ring, Black BUNA/NBR Nitrile Size: 390, Durometer: 70 Nominal Dimensions: Inner Diameter: 20 85/89(20.955) Inches (53.2257Cm), Outer Diameter: 21 3/8(21.375) Inches (54.2925Cm), Cross Section: 17/81(0.21) Inches (5.33mm) Part Number: ORBN390](https://cdn11.bigcommerce.com/s-dhkd8q3l5/images/stencil/500x659/products/4767/6099/Blk90BunX__33398.1619480948.jpg?c=2)
O-Ring, Black BUNA/NBR Nitrile Size: 390, Durometer: 70 Nominal Dimensions: Inner Diameter: 20 85/89(20.955) Inches (53.2257Cm), Outer Diameter: 21 3/8(21.375) Inches (54.2925Cm), Cross Section: 17/81(0.21) Inches (5.33mm) Part Number: ORBN390
![Brasmoyu 30pcs Adjustable Chicken Foot Rings Inner Diameter Size 2~2.4cm Chicken Poultry Flexible Retractable Foot Ring 6 Colors - Farm Animal Carriers - AliExpress Brasmoyu 30pcs Adjustable Chicken Foot Rings Inner Diameter Size 2~2.4cm Chicken Poultry Flexible Retractable Foot Ring 6 Colors - Farm Animal Carriers - AliExpress](https://ae01.alicdn.com/kf/Hf831adb07a694454b4667919f0b774d7G.jpg)