Level line post: This square (2"x2") cable railing post (39" height) is designed for building 42" cable railing projects. It is pre-drilled with 12 level line holes. It can work as both structual end posts and middle posts in level sections Weather protection: This cable railing post is made of quality T304 stainless steel with great rust resistance and will work for a long lifetime. It is ideal for both indoor and outdoor applications like deck, stair, porch, balcony, and fence. Need posts applicable in humid conditions, please search Muzata PD01 PD02 PW01 to find the aluminum cable railing posts Code compliance: This structural post is designed with 3" cable spacing. Generally, the span between two structural posts should not exceed 4 feet to pass the 4" sphere test.