The Mastercool MSC-72485-PRC Silver/Blue Universal Hydraulic Flaring Tool Set is a set of three tools that are perfect for use with transmission cooling lines. The set includes a die set for cutting 1/2" and 3/8" transmission cooling lines, an adapter set for cutting 1" cooling lines, and a tube cutter. The die set is made from durable metal and is designed to cut both metal and plastic cooling lines. The adapter set is made from durable plastic and is designed to fit both 1" and 1/2" cooling lines. The tube cutter is made from durable metal and is designed to cut both metal and plastic tubes.