Instructions for use can be found HERE
The Longworth chuck is manufactured from bakelite with a threaded connector to mount directly onto the lathe
Model: CT-LSC-250 10"
External chucking: 95-230mm
Internal chucking: 65-200mm
Fits on lathes with 12" swing or larger
Model: CT-LSC-350 14"
External chucking: 95-330mm
Internal chucking: 65-300mm
Fits on lathes of 16" swing or larger
Two sets of studs are supplied, 20mm length and 40mm length