4 x Universal 1.8mm Diameter Bars Sizes 17mm to 21mm
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4 x Universal Type Watch Spring Bars
Rust Free Stainless Steel tube & spring.
Middle tube section is 1.8mm Diameter.
These bars are designed to fit all fitting width sizes between 17mm and 21mm, ideal if you are unsure of the exact size of bars you require because they will be suitable for 17mm 18mm 19mm 20mm & 21mm width fittings.