Starrett “Little Giant” Jack Screw Sets

Sets include a Jack (A), 2 extension bases (B & C), which can be used singly or together, an auxiliary pointed screw (D), supplied to be used in place of the screw with the swivel cap, extension base (E), to be used in places where it is not possible to obtain a bearing on a flat surface, extension V base (F), for use against a cylindrical form and adjusting handle (G).

S190

• Jack base dia.: 1-1/4″
• Extensions (B) and (C) are 2″ and 1″, respectively.
• Max. height: 6-3/8″ with attachments

S191

• Jack base dia.: 1″
• Extensions (B) and (C) are 1″ and 1/2″, respectively.
• Max. height: 3-3/4″ with attachments