I recently used your drill to open the entire metal casing of the oven. This was the third time I used a racquet. Because the side wall of the furnace was drilled into, the drill worked fine until it broke. I drilled 26 gauge siding and it shouldn't have snapped that easily considering it was metal. This was annoying because I've used other similar drill bits for years and they've held up well. Only wear and tear broke its drilling performance. I have only used your product 3 times and it broke. I'm not happy with it and giving a bad rating for durability.