Dolle INSTA-Rail Vertical Cable Railing Insert Kit - 36"H Easy, affordable deck upgrade with DIY Vertical Cable Inserts from Dolle Vertical Cable Inserts for replacing wooden deck railing pickets or spindles INSTA-Rail vertical cable baluster for 36" code high railings - CHECK CODE COMPLIANCE before ordering 1 insert kit spans 72" of deck railing. Span between top and bottom rail should be 24.5" Cables spaced 4" on center - may not meet all building codes. Verify code requirements prior to purchase. 304 Stainless Steel - not recommended for direct salt water spray.