C25-ER20A-100L Collet Chuck Holder Straight Shank for CNC Milling Product Name : Straight Collet Chuck;Model : C25-ER20A-100L;Fit for : ER20 Collet Material : Metal;Color : Silver Tone , Black;Shank Dia : 25mm/ 1" Shank Hole Inner Dia : 13mm/ 0.5";Shank Length : 115mm/ 4.5" End Thread Hole Dia : 16mm/ 0.63";Overall Size : 135x 34mm / 5.3" x 1.3" (L*Max.D) Net Weight : 415g;Package Content : 1 x Straight Collet Chuck