uxcell CNC Milling Lathe C20-ER20A-150L Straight Collet Chuck Holder Product Name : Straight Collet Milling Chuck Holder;Fit for : ER20 Collets;Size : C20-ER20A-150L Material : Metal;Color : Gray, Black;Shank Dia : 20mm/ 0.78" Shank Hole Inner Dia : 14mm/ 0.55";Shank Length : 150mm/ 5.9";Total Length : 190mm/ 7.4" Nut Hole Dia : 16mm/ 0.6";Nut Size : 30 x 30mm/ 1.1" x 1.1"(L*W) Net Weight : 363g;Package Content : 1 x Straight Collet Milling Chuck Holder