These reamers have a Morse taper shank that inserts directly into the spindle of a compatible tool or into an adapter such as a Morse taper sleeve or socket. This maximizes efficiency when installing and removing the reamers. Morse taper shank reamers provide accurate centering. They are self-locking, which means they are held in place by the friction between the shank and the toolholder. Expansion reamers are used to enlarge or finish an existing hole to a precise tolerance or size. They have an adjustment screw that expands the size of the cutting head so it can be reground to its original size. This extends the life of the tool by allowing the operator to compensate for wear on the reamer's cutting edge. This listing is for each. Technical Specification Item Expansion Reamer Measurement System Fractional Inch Reamer Size 21/32 in Decimal Equivalent 0.6562 Shank Type - Machining Taper Shank Dia. MT2 Number of Flutes 6 Flute Type Straight Flute Length 1 1/4 in Material - Machining High Speed Steel Finish - Machining Bright (Uncoated) Cutting Direction - Machining Right Hand Cutting Dia. Tolerance +0.0001 in /+0.0004 in Overall Length 9 in Coolant Fed Non-Coolant Through Mode of Operation Machine Primary Material Application All Materials Reamer Application Through Hole Size - Decimal 21/32 in - 0.6562