These are used for seat mounting. They are a button head with a hex key in the head so that you don't have a hassle with two wrenches under or behind the seat when mounting your seat. The head diameter is .750, the thread length is 1" and the grip length is 2". We made the thread length 1" so that these bolts will fit different length requirements. The bolt can easily be cut down to the length that you need. These have a forged head for good fatigue strength and rolled threads.