Hy-Ko Promatic Blade Hy-Ko Promatic Blade Features Material : High speed steelSpecifications : 2-1/2″ Diameter, 1/2″ arbor holeSuitable for use with : Taylor KD1, KD5, KD8 and KD9 key machines USA SHIPPING eBay estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.