The Simpson Strong-Tie SDPW Deflector screw bit extension is available in 18" and 30" lengths. It features a quick-change hex bit holder that is great for overhead installations. The extra length allows for fastening hard-to-reach connections. It is designed for use with SDPW Deflector screw offset driver bits T25-bit kit model PWKIT25T and T40-bit kit model PWKIT40T.