This standard specifies the size of 35mm movie projection clips in six specifications with a capacity of 610m to 1775m. This standard is applicable to the projection film holders for 35mm film projectors, and not applicable to film holders for other purposes.
GB/T 9218-2005 history
2005GB/T 9218-2005 Reels for 35mm motion picture projectors-Dimensions
1988GB/T 9218-1988 Reels for 35mm motion picture projectors--Dimensions