For 4 holes handpiece: The new high quality dental parts--- Handpiece Tubing Adapter. It is the important part of dental handpiece. It is often used in changing 4 hole Handpiece on a 2 hole Connector or else. It is convenient for dentists to transform 2-hole quick connector and 4-hole quick connector easily. We would supply the excellent goods and services according to clients requirements. Packing: Adapter: 1 * Changer 2 Holes to 4 Holes.