Chuck – The specialized type of clamp that holds the bur tightly but allows it to spin.
Concentricity – The tightness of the burs rotation in relation to the center of the handpiece head.
Coupler – The connection between the handpiece and the delivery system, this must have the correct configuration of ports for air, water and light in order for the handpiece to function properly.
RPMs – Revolutions Per Minute, a measure of how fast or slow the handpiece spins the bur.
Scallops/Knurling – Patterns of bumps and indentations on the handle designed to add grip without trapping bacteria.
Torque – The rotational force of a handpiece. Torque describes how powerfully the bur can be spun, and thus how much force can be applied to the object being cut.