Description guide for plastic J channels: 1st internal width - 2nd external long leg - 3rd external short leg - 4th thickness | M = metres, mm = millimetres
J channel black is mainly used for edge protection and capping for boards and panels. The two legs are unequal in length, unlike plastic channels where both legs are equal. This product is shaped like the letter J and is manufactured from rigid PVC. You are welcome to request samples of J channel black to check suitability.