For Bolt Sizes: 1-3/4" - 2-1/8"Drill Hole Size: 1-1/16"For Pipe Size: 1"Designed To Remove Broken Studs, Bolts, Screws And Pipe FittingsAggressive Left Hand Spiral Design For Extra Gripping PowerSpiral Flutes Are Designed To Embed Themselves Deeper Into The Metal As You Turn The ToolFor Use On Right Handed Threading Only