DMW
Platinum Member
3/8" for a BX is a bit of overkill. You'll find 1/4" grade 70 a lot more convenient to use. I bought a 5/16"x20' chain first, then a couple 1/4"x10'. I have never used the 5/16" in over 5 years. The 1/4" will take everything a BX can throw at it.