Listing is for 3 pieces of Techniks part # 22225 CAT40 ER16 x 2.76" gage length collet chuck. The quality of Techniks tool holders is amongst the industry's best and hold accuracy as good or better than the competition. Balanced to 25,000 RPM at G2.5 with maximum runout of .0001" measured from taper to collet pocket, boasting top of the line accuracy at an affordable price.