819 Nipple Chuck Kit holds short or close nipples for threading. Holds studs for threading. For use with 300 Power Drive, 300 Compact, 535 and 1822 (with adapter kit) and 1224 Threading Machines. Standard Nipple Chuck includes insert and 5 adapters: 1/2", 3/4", 1", 1-1/4", and 1-1/2" (Nipple Chuck body serves as 2" adapter)