This is the trick to perfect joints every time in cuemaking.  These are custom ordered, and takes 2-4 weeks for delivery.  Solid carbide, so no worries about any reduction in size after years of use.  We make these mandrels in any joint styles, and any diameter you wish to achieve.  Common joint sizes are 3/8-10, 3/8-11, 5/16-14, 5/16-18 and Ball Screw.  Diameters range from .820 to .860 in size.  We recommend you order 2 complete sets for the best results.  One set for the finish sanding, and the other for the final finish diameter, once clear is applies.  Notice we have them priced both ways for your convenience.