Tool Sets -5 Pcs Imperial Stamping Drill Tool Bit Set Precision Tool Drill Bit Kit for Air Conditioner Conditioned Stamping Tool Highlights Generic Brand 5 Pcs Imperial Stamping Drill Tool Bit Set Precision Tool Drill Bit Kit for Air Conditioner Conditioned Stamping Tool The description: Made of high quality steel, durable. Easy and convenient to use. Pipe diameter: 3/4", 5/8", 1/2", 3/8", 1/4". Expand the copper pipe to make the two copper pipes interconnected when the air conditioner is installed.It needs to be installed on an electric drill by hand.Perfect for air conditioning crimping tool Sufficient quantity, complete specifications, perfect to complete your works.Package includes: 5 pieces pipe crimping tools Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item.Due to manual measurement, there may be 1-2cm error in size.