Features: This tripod mounting leg is for rf600mm IS and rf800mm IS , but not with other lens. The replacement legs measure approximately 91mm (L) x 38.5mm (W) x 31mm (H) (without screws) and have a net weight of approximately 95g. Due to their size, they do not fit in camera bags; The lens collar holder is according to the structure of the lens, with precisely coordinates screw holes and with slip proof locating pin. It is locked by spring-loaded screws. The tripod collar base adds the functionality of the 45mm Fit quick-release plate, which can be used directly with 39mm tripod ball heads, panoramic heads and clamps. The base of the lens collar is predrill with 1/4 and 3/8 (approx 1.9cm) screw holes and stainlessedly steel slip proof screws for attaching the lens directly to the tripod. Specifications: Model: IS-THRF680 lens replacement foot Support Stand Suitable for: for rf600mm IS & for rf800mm IS Size:about 9.1x4.50cm/3.58x1.77in This lens collar support base is 39mm standard Compatible: WMBERLEY / MARKINS / PHOTOCLAM / ball head 39mm fit. IS-JZ300 / 0 0 JZ50 / IS-JZ64 / IS-QJ58 / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK Package Includes: 1PC IS-THRF680 Lens Collar Foot Support Stand note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.