Barton Size 4 Stand-Up Block with Becket, 58mm, on Plunger Slide, 25mm (1in) T-Track

A plain-bearing stand-up block with a 58mm sheave and a becket, on a plunger-stop slide for 25mm (1in) T-track. The becket gives a dead-end point for a tackle, and the slide lets you move the lead fore and aft.

Manufacturer part number: 25312