#7R holders are only for use with the Aloris Wedge-Lock Carbide Insert blades, T-type blades or with bevel (wedge-shape) blades having parallel top and bottom edges. For bevel (see drawing) as well as T-type blades. Enables you to cut-off close to chuck. Absence of vibration prevents breaking blades. Has the same features as #7 with the advantage of rear cut-off use.