OEMTOOLS 12 blade Valve Tappet Feeler Gauge. 008" to. 026" is a precision tool designed for automotive use. Contains: Twelve offset 30 degree blades 4in long with thicknesses.008". 010". 012". 013". 014". 015". 016". 018". 019". 020". 025". 026" (.203mm-.660mm).