Blades have 30 degree offset for easy use E-Z grip handle for comfort and control This two handle, eleven feeler blade set is designed for use when setting valve tappets on many import vehicles.The screw and nut feature allows the user to easily switch blade sizes or to replace damaged blades. The following sizes are: .004/.102mm, .007/.178mm, .010/.254mm, .013/.330, .005/127mm, .012/.305mm, .008/.203mm, .011/.279mm, .014/.356mm, .006/152mm and .009/.229mm