wFeatures: The port and polish kit is made from High quality aluminum oxide coated abrasive cloth provides a solid and durable grinding power combined with high efficiency and long life to give you that premium performance that you need and expect from your tools. This Cylinder Head Porting Kit they are for use on auto engines.The porting and polishing kit is Very Satisfactory for Porting Aluminum Cylinder Heads And Intake Manifolds. The mounted flap sanding wheels are commonly used in metalworking as a grinding or deburring wheel to clean up welds and cuts in iron, stainless steel and metal alloys. Also used for removing layers of rust and paint on flat metal surfaces Cone Shaped :80/120 /240 Grit, Cylinder Shaped : 80/100/120 Grit ,Each contains two length specifications: 38mm/48mm. The set has a total of 62pcs. Specification: * Product Name: Mini Sanding Engine Port and Polish Assortment Kit * Material: Aluminum Oxide * Specification: Cone: 1.5inch x 0.47inch x 0.25inch, 1.9inch x 0.47inch x 0.25inch; Cylinder : 1.5inch x 0.47inch x 0.47inch, 1.9inch x 0.47inch x 0.47inch * Shape: Cone/Cylinder Shaped * Quantity: 62 Package Content: * Package: 62pcs Cone and Cylinder Shaped Assortment Kit Two Length specifications are available.