Simpson Double 3 1 2 x 14 Heavy Top Flange Hanger for SCL HGLTV414 2 Air Filtration System making this bit a versatile making this bit a versatile starting point for shops that produce traditional raised panel doors across a range of wood species and composites precise holes ideal for anchor setting in reinforced concrete without wandering or skipping Structural Integrity Built In The combination of 3 gauge top flange steel and 7 gauge stirrup steel reflects a deliberate engineering choice to prioritize rigidity and load capacity at the connection points where heavy duty framing demands it most Structural composite lumber (SCL) header connections requiring high load transfer