Muzata 36''x2''x2''Level-Drilled Flat Side Mount Black Post PF02 BH4S handrail Manufacturer Muzata Model Number HA01

Manufacturer Muzata Model Number HA01 BNP Material POM Style  For Rectangle Handrail HT10 Finish Type Powder Coated

They can also work with cable railing kit on END posts to for a neater look

Muzata PS02 BH4L

But it could be increased to 7 feet if you add a stabilizer post between them

HA24 level pivot connector

Muzata 36''x2''x2''Level-Drilled Flat Side Mount Black Post PF02 BH4S handrail Manufacturer Muzata Model Number HA01Product Overview square side mount stainless steel cable railing post with flat top. Pre drilled with 10 pairs of level holes for easy installation on horizontal sections. Made from rust resistant T304 stainless steel for indoor and outdoor use. Meets 3" cable spacing for code compliance Side mounted Installation This 36" square post is designed to be installed against the side of the landing. It is pre drilled with 10 pairs of level holes to work on