These are typically used for securing parts with a boss to a shaft.
10 x Meccano Brass Collars Part 59
Meccano 10 x #2 5.5" Perforated Strips - 1950s med green with some wear
Meccano 10 x #2 5.5" Perforated Strips - 1934-41 Gold With Heavy Wear
Meccano 10 x #2 5.5" Perforated Strips 1979 Dark Blue Worn
Meccano 10 x #2 5.5" Perforated Strips - Double stamped nickel
Meccano Two Rubber Track A047 10" x 1" Eight Flanged Wheel Center B451 Used