1. Width of stair tread.
2. The flat iron for stair treads includes two kinds of specifications:
(1)65x6mm and 75x6mm.
(2)The size of carrier angle is (L)50x50x6mm.
1. Width of stair tread(W): 185, 215, 245, 275. 305.
2. Center distance between holes(A): 90 110 140 170.200.