Tool OK. Parts and instructions make me think there are many ways to service wear parts. Knowledge of the mechanics of O-rings, bearings, seals, etc. is very helpful. Well, if you're a pro, don't expect a very durable tool to throw around. You can also upgrade better parts or the coolant pump. The drill chuck rusts! Make sure to oil it right before and after use, blow dry if possible or get a stainless steel cartridge. Now this tool pays off instead of calling a dealer to drill a hole for your grill etc. Pay a guy $359 to $500 plus call service or buy the tool yourself and use it and then use it for years. Then it comes with bits! Purchase additional pieces in your regular sizes that share the same design (e.g. an open hole for water flow, etc.). The beats alone cost the same in local shops. DO NOT let your employees use this unless they agree to pay for it if they damage it in any way first. This tool is not designed for use on sandy and gravel job sites. At least they tried to build an instrument that is hard to find in other brands. The packaging it comes in is junk. You must get a custom case or something. The holes he makes in thick marble and porcelain are of very good quality. Much luck.