This a new Jacobs 3/8" Drill Chuck on a new MT1 Arbor. Chuck key is included but is not the one shown.
These Arbors are brand new, they aren't old stock. Made of carbon steel. The dimensions. 1/2"-20 Tpi thread. Their very high quality. These aren't hand drill quality, their machinist quality chucks.
The taper on the arbor may be to long for your machine. These arbors are case hardened but still easily cut.
Auction is for 1 Drill Chuck, 1 chuck key and 1 Arbor.