Grip-Rite exterior screws feature T25-T30 star drive heads to reduce cam outs when driving into your outdoor project. Our T-15 star drive exterior trim head screws are the perfect solution for railing, siding or anywhere a thinner shank and smaller head are desired. Type 17 point tips on both screws reduce the need to pre-drill and help to keep the material from splitting. Coarse threading pull the material substrates together for a solid, tight connection.