The Speed Screw replaces the rear leg in the Sinclair Rifle Rest. It is used for high speed vertical travel between the record target and the sighter target, and for quick fine-tune vertical adjustments. All stainless steel construction and quality machining make this product work flawlessly.
NOTE: Will fit Sinclair, Hart and Bald Eagle pedestals only. Three eights x sixteen thread
Sinclair, Issue:4A, Page:163