The facom metric hex bit set 9 piece consists of 9 12 inch drive bits for hexagon socket heads the bits are non removeable and therefore will stay securely in place during use this set comprises one of each of the following hex bit sizes 5mm 6mm 7mm 8mm 10mm 12mm 14mm 17 and 19mm combined these bits cover the most common screw sizes and are ideal for driving hex screws supplied in a plastic moulded case for easy storage each bit has the following specifications overall length 60mm bit length 24m