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 wrenchs under or behind the seat when mounting your seat. The head diameter is .750 ,the thread length is 1" and the grip length is 1 1/2". 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 stength and rolled threads.