If you own or ever owned a Panerai watch, you know what these are; they are now used by many more watch fans on many more watch brands and straps. They go inside the lug width of straps and the springs or screw bars pass through them, for a better fit. They come in two diameters: Ø1.80mm (for Ø1.78mm bars or thinner) & 2.55mm (for Ø2.00mm bars or thinner). You will receive two pairs (4 tubes) of the diameter/length you choose. Springbars are not included but can be purchased separately.
Choose your desired diameter and length from the drop down menu and do not hesitate to contact me for any questions you might have.