Full weld quartz banger for use with a 25mm coil that can be secured with a cotter pin (your coil should be partly closed on one end with a 10-15mm hole).   Each piece features 2mm walls, a 4mm base, a precise bevel over the top of the bucket and a post with a channel for securing your coil with a cotter pin (included).  The thick base retains heat longer than the cheaper bangers while the beveled edge ensures a good seal with your carb cap (especially well made ball caps).  Available in 14mm Male 90 degree.