This spinnaker crane attaches to the masthead truck without any additional holes or fasteners. All of the parts shown are included. Just remove the stock clevis pins for the forward halyard sheaves, forestay, and the original spinnakerhalyard pin and replace them with the longer pins provided. The crane moves the spinnakerhalyard block forward. The block is now farther away from the forestay. The bail allows the block to position itself for a fair lead regardless of what tack or point of sail you're on.