Rtreehouse is the ONLY legitimate to sell this product, Not authoriz to seller `` E-LING '', and recently have denial reviews, these did n't base on the harmonious, PLS be noted. `` in effect Product for Customer '' is the commitment from our team, if you meet any issue about this product, PLS feel supply contact us by clicking `` Contact the seller '', we will the first base time provide fully support for you about technique and this product.E Type hole saw specially designed for drilling hole cutting hole in arduous material specified as glossy instrumentality tile, porcelain tile, glass, marble, granite, dremel circle tool, and very rich to use by masses User manual of arms which explain each step with illustration. The factory the latest ripe `` vacuum welding process '' to joint diamond to tip, make trusted hole saw more durable.How to attribute assurance for E type hole saw during production. . Every 15, Engineering Team check all process parameter to meet requirement. . Every, worker on line check the diamond density with loupe. . Every 30 minutes QC randomly 3 samples from production line to check the diamond density and then drill glass, instrumentation, porcelain to check the durability, meanwhile preserve X-Bar Chart for attribute control.Saw hole in glass bottle or glass tile. . hole with E Type hole saw. . hole to the size you want. . shine with H Type Rubber Bit part packing box.Drill hole in wall cover with shower porcelain tile. . hole in porcelain tile with E Type hole saw. . hole to the size you want.Items part Packing Box : .7 * E Type Hole Saws. * H Type rough Bits .4 * H Type large thin Bits .4 * H Type pocket-size thin Bits .4 * H Type Rubber Bits .4 * A Type Grind Bits .1 * A Type Rubber Bit .1 * Collet .1 * Triangle Drill Bit 5.0 mm .1 * Triangle Drill Bit 6.0 mm .1 * Triangle Drill Bit 8.0 mm .1 * User manual of arms .