I have looked on several sites and the ROUND DD medium frequency and high frequency coils are not 10.5" but rather 10". At least, that is what they are advertised. Since I have been studying Xterra Forum here, I see frequent mention of a 10.5" coil. Is it manufactured by Minelab? Coiltek? The Minelab Round DD coils are advertised at just ten inches instead of ten point five. I don't know why this is nagging at me so much, but can someone clear this up for me??? Thank you. kevin