THIS IS AN ALLIED MACHINE & ENGINEERING AMEC A SERIES HOLDER, MODEL 20611-1000. IT IS AN A UNIVERSAL SERIES HOLDER WITH A SHORT STRAIGHT SHANK MEASURING 1". THE HOLDER ACCOMMODATES A BLADE SIZE FROM 31/32" TO 1-3/8". IT FEATURES A 3" FLUTE LENGTH AND A 6-1/2" OVERALL LENGTH. THE HOLDER IS DESIGNED FOR COOLANT FED OPERATION AND IS IDENTIFIED AS A SHORT #100 FLUTE STANDARD LENGTH SHANK TYPE.