The PF Series hangers have been designed to accommodate collated 0.148 x 1-1/2 in nails as well as 0.148 x 3 in nails. The PFB and PFDB have dome-shaped joist nail holes that guide nails into the proper installation angle. The design also features a folded seat that raises the 2x joist very slightly above the seat radius to enable a tighter connection to the back of the hanger. For saddle hangers, PFDB and PFDSB are for solid sawn lumber carrying members and PFDL is for LVL carrying members.