Easy connection: Used to expand the copper tube, make the copper tube expand and - easy to connect. High quality materials: This tubular pipe expander kit is made of high quality steel, abrasion resistant, not easy to deform and durable. Note: When installing the air conditioner, the pipe expander should be installed on the electric hand drill and the copper pipes are unfolded to allow the 2 copper pipes to communicate with each other. Easy to carry: small size, easy to carry when going out, such as outdoor air conditioning installation Multiple uses: Can be used for air conditioning equipment, refrigeration equipment, automotive air conditioning, etc. Item Specification : Package Included:1 Set Material:Bearing Steel Approximate Size:Specification Width:7/8 (22.2mm), 3/4 (19mm), 5/8 (15.9mm), 1/2 (12.7mm), 3/8 (9.5mm), 1/4 (6 ,3 mm) height: The height of 1/4 and 3/8 is 4.5 cm; the height of 1/2 and 5/8 is 5 cm; height of 3/4 and 7/8 is 5.5cm Product feature: Easy connection : Used to expand the copper tube, make the copper tube expand and - easy to connect. Note: When installing the air conditioner, the pipe expander must be installed on the drill handheld and the copper pipes are unfolded to allow the 2 copper pipes to communicate with each other. High quality materials: This tubular pipe expander kit is made of high quality steel, abrasion resistant, not easy to deform and durable.