An easily adjustable, two-position, spring-loaded pin stop allows this car to be fixed in place or travel freely on ultra low-friction plastic car slides. Made of lightweight and corrosion-resistant black anodized aluminum. Sheave dia.: 1-1/4" x 1-1/2"W for one or two sheets up to 5/8"dia. SWL: 3,300lb. Fits 1-1/4" T-track