RingMaster<tm> crimp tools are used with copper crimp rings to secure brass or poly alloy barbed insert PEX fittings in PEX tubing. 3/8", 1/2", and 3/4" tools have 15" handles and 1" tool has 19" handles to provide more leverage to secure crimp rings onto tubing and fittings. Tools are available in 3/8" to 1".