Diamond Core Drill Bit Set 6/20/30/35/50/68 Vacuum Brazed Diamond Hole. When you are building/remodeling a bathroom or kitchen like installing shower or install the faucet and handles in bathroom, you will need to drill holes through Porcelain tiles without cracking, so you could use our diamond tip drill bit to make those holes very precise Diameter 6-16 mm tile hole saw add wax lubricant inside. The wax will melt while drilling through porcelain tile and help cooling and Lubrication For a better finish and longer duration of the porcelain tile drill bit, you could start on a slight angle at its lowest speed for better control, then with light pressure carefully work through the tile The average life of the tile hole saw depends on several factors, including the type of aggregate and material, its thickness/hardness, proper cooling and use Quality Creates Better Life. All our products are subjected to strict quality tests. We want all the products can be recognized for their quality and durability Features. Size Diamond drill bit–6/20/30/35/50/68, diamond height 10mm, total length 60 mm, M14 thread. Size Diamond chamfer bit :2 Inch (50mm), 46mm workable length, M14 Thread, Grit #80, total Length 55mm, Top Angle 60 degree. Machine –For use on angle grinders. Wide Application of drill bit –Worked great for porcelain tile, ceramics, bathroom tile, marble granite, stone, masonry, brick with ease, Using water could prolong the lifetime. Wide Application of chamfer bit–enlarge/shape/round the EXISTING HOLES. Reduce the risk of cracking with standard and large format tiles subjected to tension (ex tightened plumbing, led lights etc), Bevel Ease chamfers and stress relieves rough holes in glass, ceramic and porcelain tiles. We are a small, family UK business. So every customer order is so important to us. We always endeavour to ensure our customer experience is smooth, seamless & second to none. Would you like you item delivered on a particular day? Then just include a note when ordering and we will try our best to accommodate (no guarantees though). We always leave customer feedback in advance. Please, please please, don’t forget to leave us feedback once you have received your item, it’s so important for us to know how you found the process & if we can improve on it. If you encounter any issues with your order, please reach out to us first & we will do everything we can to resolve the problem.