The Slim-Claw will fasten to both 1-1/2 Schedule 40 pipe (1.90 OD) and 2 OD truss tube. The Claw has a 3-1/2 T-handle so no tools are required to fasten to the pipe. Comes with 1 x 1/2 -13 TPI Grade 5 fastener and 1 diameter Belleville Spring washer.