By Rockwell International. Still in wraps. Mortising chisel bit ONLY. 1/4"--21 pieces, 5/16"--3 pieces, 3/8"--1 piece. Shank size 15.8mm, 0.634 th. , 41/64" All for $25.00 as shown in picture Contact by Phone or email and leave message (no message no return call-SPAM) 808 two 8four3 six2zero.