The hydraulic cylinder control block is designed for 1 inch to 1-1/2 inch cylinder rods. These blocks are constructed of a high grade aluminum alloy that is heat treated, making them ideal for long, tough, durable use. Highlights: Band Width: 3/8 inch Maximum PSI: 3,000 Lbs Maximum Temperature: 250 Degrees Fahrenheit For 1 inch To 1-1/2 inch Rods Designed for cylinder rods Constructed of a high grade Heat treated aluminum alloy Which makes it extremely durable, installs & removes in seconds Can be used on hydraulic or air operated cylinders