This keyed chuck has a 1/2 inch capacity with a 1/2 inch - 20 thread. Use with chuck key 48-66-3280 and key holder 48-66-4040. It can be used on reversing drills of matching capacities and threaded spindles.
"Thank you for notifying me. It was received in great shape and is exactly
what I ordered. Thank you very much. I will certainly order with you again."