Single Pulley Block Material : Alloy, Cast Iron,Steel Finish: Black/Galvanized Size: 1/2"(13mm) 3/4"(20mm) 1"(25mm) 1-1/4"(30mm) 1-1/2"(40mm) 2"(50mm) 2-1/2"(63mm) 3"(76mm) Application : Building Material Shops, Manufacturer, General Industry.