Product Name : Reducing Drill Sleeve;Type : MT2 to MT3;Adapter Diameter : 25mm/ 1" Adapter End Hole Dia : 17mm/ 0.67";Side Hole Size : 21x 7.5mm/0.83" x 0.3"(L*W) Tip Size : 20 x 19 x 8mm/0.8" x 0.75" x 0.31"(L*W*T);Total Length : 113mm/4.4" Material : Metal;Color : Silver Tone, Black The Morse Taper Sleeve is mainly used in drilling machine and lathe machine. Drill sleeves is used to change the taper of the connective arbors. Morse taper shank allows the tool to be inserted directly into the machines spindle to facilitate high-torque applications such as large cut diameters. Package Content : 1 x Reducing Drill Sleeve Note:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.