TCT Dovetail Standard sizes for all dovetail and sliding dovetail applications ie slot dovetail, hidden dovetail, etc. DESCRIPTION Available with scribers on TTDCS14.3-8 & TTDCS127-1/4 to enable use in conjunction with portable routing jigs. Parts TTADC12B-1/4, TTBDC14B-1/4 have shank mounted bearings fitted.