please use this model no. and the taper you would like. "Shank" is the tapered section of a live or dead (solid) center that normally fits into a tailstock unit. It can be a Morse... List Price Parts Breakdown Capacity Thrust Load Radial Load T.P.F "A" is the Over All Length (O.A.L.) of a center from back end to point. "B" is the taper length of the center, from... above center line on half centers. "G" is the cutout length on half centers. "H" is the gage line diameter "J" is the included point angle. "J2" is the 2nd included point angle...