Manufacturing Variation of McFeely's Screw's Square Hole Dimensions
I, as customer of many years, have a dedicated cabinet holding a wide assortment of your square drive screws -flat head, pan head, washer head and trim head screws covering a large range of lengths for #6, #7, and #8 sizes. My frustration more recently (last 4-5 years) is the unacceptable range of production variation of the square hole height/width dimensions. Some screws fit great with full depth engagement and easy removal of driver, some are essentially near full depth fit resulting in wedging of driver bit causing difficult removal, and the most discouraging issue occurs when you can engage only the tip of the driver bit resulting in slippage at the bit/sq.hole interface causing rapid rounding of the end of the square driver bit. All of these three conditions may be found on screws from the same box as well as across multiple sizes. I would suggest that McFeelys tighten up their sq. hole dimension tolerances and provide more rigor in their quality acceptance criteria. Sticking or slipping driver bits should not be the reputation of McFelly's square drive screws.