Check the listing for details. Greenlee 741-BB 3-1/2" Conduit Knockout Punch & Die Set 4 inch diameter hole. Condition: New. Listed at 410.00 USD. This Greenlee 741-BB 3-1/2" Conduit Knockout Punch & Die Set is the perfect tool for your hydraulic needs. The set includes a 4 inch diameter hole and is designed for easy installation and use. The brand is Greenlee and the model is 741-BB, making it a reliable and efficient choice for your business. The set is ideal for use in various industries, including construction and industrial settings. It is a hand tool and belongs to the category of knockout and punch sets, making it a versatile addition to your toolbox. GREENLEE 741BBKnockout Punch Unit / 3-1/2COND PNCH SET BPunch Type:RoundCapacity:10 Gauge Mild SteelConduit/Pipe Size:3-1/2 InchHole Size:4 InchContents:Punch, Die, Draw Stud, Ball Bearing NutWeight:10 lbs