This is a 2-13mm drill chuck, a SDS plus shank to mount on the headstock of any lathe or in any mills.
Soldering Iron Gun
Specification:
Thread Mount: 1/2-20UNF
Capacity: 2-13mm
Overall Size: 62 x 42mm / 2.4" x 1.7"(L*D)
Package Content:
1 x Keyless Drill Chuck