8 x 8mm Brass Alignment Dowels and 7.5mm drill bit for Model Railway Baseboards. These are precision engineered brass dowels to ensure your tracks are aligned when joining sections of baseboard together. Both parts are made from brass and have an 8mm diameter, total length when together is 22mm individual parts have insertable part measuring 11mm. The drill bit is a HSS rolled steel bit and 0.5mm smaller than the dowels to allow a good tight fit. The best method for installing dowels is to drill through both pieces of timber at the same time to allow for accurate joints. The ideal way is to clamp both pieces together. Once the timber is drilled the dowels can be tapped into place using a hammer, as the drill bit size gives a good tight fit to prevent movement. These will be well packed and posted using Royal Mail after payment has been completed. If you have any queries or questions about the listing please contact me. Thanks for looking.