About This Wisscool swaging tool seeks to increase the inside diameter of tubing head, eliminate the need for additional fittings, which can potentially save your money Finish for durability and longevity: durable nickel plated with zinc alloy body, anti-corrosion for lifetime use This tube expander is simple enough to keep in a tool bag and requires no hammer, no block and no need to setup. Just remember to rotate the copper after each “pump” of the tool to achieve a nice uniform swage Wisscool tube expander can be used to expand pipe/tube with diameter: 6/8/10/12/16/19/22mm(metric) 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 7/8"(inch) Patented design, high-strength spring helps to reduce hand fatigue Applicated for hvac line copper pipe, refrigeration tube Overview Brand : Wisscool Material : Zinc alloy Color : Silver Item Weight : 0.41 Kilograms Manufacturer : Wisscool Specific Uses For Product : HVAC repair, Refrigeration maintenance, Emergency situations