Stanho Non-Rok keys (formerly Standard Automotive keys) are available in most sizes; however, some sizes have become obsolete. Like Hi-Pro keys, they are made of the same material as Hi-Pro Keys. Non-Rok keys are Standard's own design solution to keying problems. Size standards are identical between Wooduff and Non-Rok keys. Shear strength is equal since the shear line is dimensionally equal in comparative sizes. No design changes are necessary as there is no deviation from normal slotting. Most commercial range of steel specifications, tolerances, tempers and finishes is available. With few exceptions, Non-Rok keys may be substituted in assemblies because they are more readily installed and overcome objectionable impinging due to key rotation within the keyway.