Used whenever there is a need to stabilize the chimney above the roof level. The purpose of the bracing is to hold the chimney against wind load, and to prevent damage from static and sliding snow. It should be used, at a midpoint on the chimney.Highlights:Size: 6"No. 6T-RBKType A chimneyStabilizes the chimney above the roofFrom 5'' to 10'' above the roof one T-RBK should be used, at a midpoint on the chimneyOver 10'' use one RBK4'' from the roof and one RBK every 5'' thereafterIncludes: support band, adjustable tube, bolt adjustment and roof bracketBoxed