These weight jack bolts are precisely cut for quick adjustment. They are made of durable steel to withstand track conditions and feature coarse threading for easy adjustment during a quick change on the track. Zinc plated steel. 1"-8 coarse thread. 11" overall length, 10" thread length. Top is relieved for 1/2" ratchet drive. Bottom is drilled and tapped 1/4"-20 to allow spring cup to be affixed to jack bolt.