Crosby Jaw & Jaw Turnbuckles have forged jaw ends that are fitted with a nut & bolt on the 1/4″ thru 5/8 ” size. Cotter pins are provided on 3/4″ thru 2-3/4″ sizes. End fittings are quenched and tempered for greater strength. Turnbuckles are suggested for straight or in-line pull only. Working Load Limit of 500-3500 Lbs.