ITEM NAME:Lathes Part MT3 to MT4 Morse Taper Adapter Reducing Drill Sleeve H2D5 Lathes Part MT3 to MT4 Morse Taper Adapter Reducing Drill Sleeve H2D5 Morse taper 3# to Morse taper 4# . Morse taper shank allows the tool to be inserted directly into the machine's spindle to facilitate high-torque applications such as large cut diameters. Product Name : Reducing Drill Sleeve Type : MT3 to MT4 Bore Diameter : 34mm / 1.3" External Max.Diameter : 24mm / 0.9" Total Length : 140mm / 5.5" Material : Metal Color : Silver Tone Package Content : 1 x Reducing Drill Sleeve Note:Light shooting 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.