A stock of material that is one foot or greater in length, and from which shaft keys are made. We manufacture keystock to suit every application need you have, in every size, grade and tolerance imaginable. Available in stocked standard sizes or custom made to your specifications. MAK-A-KEY Key Stock, Imperial Undersized, 3/8 in Width, 3/8 in Height, 3 ft Length, Carbon Steel, Plain, Square Style, 50 HRB Hardness