6 x Double Flanged 1.5mm Diameter Bars 16 18 20mm
6 x Watch Spring Bars [2 x 16mm 18mm & 20mm].
Rust Free Stainless Steel tube & spring.
Middle tube section is 1.5mm Diameter.
PLEASE NOTE - All sizes quoted are for the bars fully compressed. Centre section of tube will be smaller than the compressed size because these are flanged spring bars and each end will slightly protrude each side of the middle tube.