Length 104HP = 104x 5,08 = 528,32 + margin* = 530mm
Weight per rail +/- 150 grams
Due to years of building experience we cut our rails with a a little length margin*.
Why? Not all modules have an exact HP width so it can happen that when you cut the rails to exact 104HP dimension not all your modules will fit. The threaded strips/inserts have an exact 104HP size, so you can’t go wrong installing your modules. Trust us, we’ve been there:)