THIS A USED APT SLOT MASTER ADJUSTABLE WIDTH 3" DIAMETER SLOTTING CUTTER WITH EXTRA CTA-2 INSERTS. THIS IS A 6 INSERT CUTTER AND IS ADJUSTABLE FROM .375" TO .530" WIDTH. IT HAS A 1" WELDON SHANK AND THE INSERTS ARE A C-5 GRADE WITH A 3/32" RADIUS. I ONLY USED THIS CUTTER 1 TIME TO CUT ALUMINUM AND THE INSERTS IN THE TOOL ARE STILL IN USABLE CONDITION AND THERE IS 4 NEW INSERTS IN THE BOX. NEED MORE INFO, SELECT LINK BELOW.