4X4 SCREW JACK SPECIFICATIONS:

For Standard Dressed 4x4 Lumber

4"x 4" x5" Square Tubing

1-1/2" x 6-1/2" Pipe

 1-1/4" Acme Threads

 14.25" Overall Length Screwed Down

Full 6" Adjustment

 Inner Pipe Is Packed With Grease To Prevent Rusting

For Standard Dressed 6x6  Lumber

 6" x 6" x 5" Square Tubing

 2" x 6-1/2" Pipe

 1-3/4" Acme Threads

 15-1/2" Overall Length Screwed Down

Full 6" Adjustment

 Inner Pipe Packed With Grease To Prevent Rusting