1-3/4 inch length, 3/4 inch pilot, 5/16 inch-24 bolts
Package Dimensions: 21.082 L x 6.35 H x 11.684 W (centimeters)
The kit comes complete with necessary hardware to install replacement fan. It is for use with Hayden Swirl-Flex and semi-flex fans. It is complete with spacer, bolts and washers.