This is a standard worm-gear style hose clamp, used for securing a hose with a 12mm, 13mm, 14mm, or 15mm (max) outside diameter. This is a common clamp for fuel hoses or other smaller coolant lines.
This clamp is sold as a universal part, so be sure to measure and check your needs first before buying. This hose clamp can be used on all sorts of fitments of all makes/models/types.
This clamp replaces the original BMW hose clamp, part number 07129952104 (07 12 9 952 104) as used on many BMWs chassis/models, bother old and new.