This starter kit is perfect for the DIY homeowner or the professional looking for the perfect way to get started with PEX plumbing. Here is what's included: R1245 Crimp Tool with Lock Hook R1653 Pex Scissor Shear Cutter with Lock Hook - Fits 3/8"- 1" EPCR0034 3/4" Crimp Rings (1 bag of 50) HC034 3/4" Half Clamp with Nail (1 bag of 100) PXLN034 3/4" x 3/4" Brass Elbows (1 bag of 25) EPCP034-NL 3/4" x 3/4" Brass Couplings (1 bag of 25) PFW-B34500 3/4" Blue PexFlow Tubing 500ft Coil PFW-R34500 3/4" Red PexFlow Tubing 500ft Coil PEXFLOW cross-linked polyethylene, both red and blue, is produced using the silane based technology. This involves the grafting organo-silanes onto a base material of cross-linkable high density polyethylene. Cross-linking is initiated at the time of production and is accelerated through the introduction of Heat and water/steam as a post production process. PEXFLOW meets the requirements of ASTM F 876 and ASTM F 877, all tubing is SDR-9 (determines wall thickness) and is produced to copper tube size (CTS) dimensions. QUALITY ASSURANCE Marking the product with the ASTM F876/F877 reference is a statement that this material was produced, Inspected and tested to be in conformance with these specifications. The reference to NSF certification is your assurance the material was tested for health effects to ANSI/NSF standard 61 and product performance to ANSI/NSF standard 14. NSF CL-TD is the assurance the material has been and continues to Be tested and conforms to NSF Protocol P171, Chlorine Resistance of Plastic Piping Materials. Certified By NSF for use in Traditional Domestic applications by testing against ASTM Standard F2023, Evaluating Tubing and Systems to Hot Chlorinated Water. This standard is more stringent than ASTM F876, providing a greater assurance of meeting design life predictions in adverse environments.