C16-ER20A-100L 16mmx100mm Metal Straight Collet Milling Chuck Holder Product Name : Straight Collet Chuck;Model : C16-ER20A-100L;Fit for : ER20Collet Material : Metal;Color : Silver Tone , Black;Shank Dia : 16mm/ 0.63" Shank Hole Inner Dia : 10mm/ 0.39";Shank Length : 100mm/ 4";Nut Hole Dia : 16mm/ 0.63" Hex Width : 30mm/ 1.2";Overall Size : 138 x 34 mm / 5.4" x 1.3" (L*Max.D) Net Weight : 240g;Package Content : 1 x Straight Collet Chuck