Model usage [for reference only]. 25mm: 4-branch pipe (generally used for water pipes and water heaters). 32mm: 6-branch pipe (generally used for water pipes and water heaters). 40mm: 1 inch tube. 56-63mm: 1P-2P air conditioning and sanitation pipes. 76mm: 2P-5P air conditioning and sanitation pipes. 120mm: Sewage and fire pipes. 168mm: Household universal range hood pipeline. 180mm: Imported range hood pipelin. Drill Bit x 1pcs. Please list your special requests color, packages, etc. (15-35 Days to Delived). Please contact me before you return it. Not accept returning of electronic components. Feedback is very important to us.