Universal Parting Blade Holder
#7 and #7R Holders are only for use with T-type blades shown below; or with bevel (wedge-shape) blades having parallel top and bottom edges, as shown below. For bevel (see drawing) as well as T-type blades. Enables you to cut-off close to chuck. Absence of vibration prevents breaking blades.
Universal Parting Blade Tool Holder-Reversible
Has the same features as #7 with the advantage of rear cut-off use.