Contol Rod Compatible Bolt Hole Diameter 1 in End Type Chisel Point Finish Zinc-Plated Material Steel Material Grade/Class Not Applicable Overall Length 18 in Restricted Motion Direction Expansion Thread Direction Right Hand Thread Fit Not Applicable Thread Size 7/8 In.-9 Thread Type UNC Compatible Joint Type Single Bulb Control Unit Type Control Rod For Pipe Size 10 in Includes Nuts Yes