Believe these are older SCAT units. We had both SCAT and Gene Berg mills set up at one time, these are the ones we've unearthed. Two are illustrated above, only 1 MILL/FLYCUTTER per order. Both are set up currently for 90.5mm *(1776cc) cuts. From the Manufacturers Website: Versatile and inexpensive Special Professional tool designed to bore cases & heads for oversize cylinders & pistons or flycut heads for increased compression * Tool may be used with mill or drill press. * Ring base of tool housing eliminates necessity of milling head surfaces to use tool * 356-T6 Aircraft Quality Aluminum Housing machined to exacting tolerances with Gits oil fitting to lubricate the 1-1/2" diameter precision ground steel shaft * 3/4" x 1-1/4" Steel Tool Holder & Centering Block are precision machined to insure accuracy * Precision machined tool steel cutter * Steel components are black-oxide finished to insure long corrosion resistant use * Let me know if you have any questions!