Features:

Keyless Drill Chuck Capacity, 1/2", and it's integrate with CAT40 holder into one piece

Accuracy is about 2 to 3 thousands, not 10 or 20 thousands, and any comparisons are welcome

Drill chuck has very strong holding power.

All Jaws are Hardened

CAT40 and drill chuck are integrated together, it's a solid one piece, not J6 or J33 tapper connection.

Price is for 2PC

V-Flange CAT 40 is production balanced and meet standard industrial needs

Your option of HAAS or Mazak style pull stud, and ready to be used on those two machines with cat40 spindle

Decent quality at reasonable price