The SharkBite PEX crimp tool kit allows you to make a secure connection to PEX tubing with copper crimp rings 3/8 in., 1/2 in., 3/4 in. and 1 in. in size (copper crimp rings sold separately). The kit boasts a 1 in. PEX crimp tool and three dies for each crimp size, which can be changed without any special tools. The kit also includes a go/no-go gauge for gauging crimps and lightweight, composite handles, which reduce fatigue as you work.