Barton Size 5 Stand-Up Block, 54mm, on Plunger Slide, 25mm (1in) T-Track

A Barton Series 5 plain-bearing block with a 54mm sheave, held upright on a plunger-stop slide for 25mm (1in) T-track. It stands ready for the sheet, and the slide lets you move the lead fore and aft.

Manufacturer part number: 25311