Suggested Retail: $29. FocusFoto Metal Tripod Collar Mount Ring B (W) 1/4" for Canon EF 70-200mm f/2.8L USM, Canon EF 70-200mm f/2.8L I/II/III is USM, 100-400mm f/4.5-5.6L is USM, 35-350mm f/3.5-5.6L USM, 300mm f/4L is USM. Lot: 184, Condition: NO PACKAGE, Full Lot Title: FocusFoto Metal Tripod Collar Mount Ring B (W) 1/4" for Canon EF 70-200mm f/2.8L USM, Canon EF 70-200mm f/2.8L I/II/III is USM, 100-400mm f/4.5-5.6L is USM, 35-350mm f/3.5-5.6L USM, 300mm f/4L is USM, Retail_Price: $29, Suitable for Canon EF 70-200mm f/2.8L USM; Canon EF 70-200mm f/2.8L IS USM; Canon EF 70-200mm f/2.8L IS II USM; Canon EF 70-200mm f/2.8L IS III USM; Canon EF 100-400mm f/4.5-5.6L IS USM; Canon EF 35-350mm f/3.5-5.6L USM; Canon EF 300mm f/4L IS USM The tripod mount ring mount on the tripod, it helps you fix and balance your tele lens which is heavy or long lens hanging off the front of camera. Made by metal with high quality and strong building. The UNC (Unified National Coarse Thread) is 1/4"; Ring diameter: 78mm; Ring width: 18mm; Ring thickness: 4mm; Bottom plate length: 60mm; Color: White; Weight: 155g Quick release plate is AS 39mm standard, compatible with RRS / ARCA-SWISS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit. 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.