You can always tell the difference between an experienced, professional tiler's finish and the DIY enthusiast. It's invariably a case of 'nearly but not quite'! There is no substitute for possessing real insider knowledge, trained skills, and investment in quality tools.How many times have we seen workmanship which leaves much to be desired? From a clear bodged job to a solution to a problem which may just be OK but doesn't quite look right! Even an apparently simple action like drilling a hole is complex and you need to know every detail from nature of the material, type of drill required, speed, torque, testing, pilot holes, etc, Not to mention, resisting the temptation to buy cheap, substandard drills - and how to recognise them!When it come to drilling holes in Porcelain tiles,?