These 1/4-20 x 1-1/2" elevator bolts and nylon nut set are made of steel with a zinc finish. The flat head style and coarse thread type make them suitable for various applications. With a quantity of 100, they can provide enough supply for your needs. The length of the bolt from the bottom of the head to the end of the thread is 1-1/2in. The thread size is 20, and the thread diameter is 1/4in. These elevator bolts are grade 2 and have a thread pitch of 20. The brand is Tru-Fast, and they are made in Taiwan.