[Premium Material]:The four flute sawtooth eccentric drill bits are made of quality alloy material with wear resistance and high hardness,which improves work efficiency [Multifunctional Drill]:The skewed head eccentric drill bits Provide accurate drill on tiles,glass,brick walls,wood,concrete,metal,ceramic,etc [Hexagonal Shank]:The four edged serrated eccentric drill bits adopt hexagon shank design ensuring good stability,and will not easily slippage or deviation,resulting in smooth pipe mouths [Unique Design]:The sawtooth eccentric drill bits adopt threaded discharge groove design,expand discharge space,eccentric positioning tip design,accurate positioning,fast drilling [Product Size]:The home drill bits size is 6mm 8mm, Weight: 0.2314853751 Pounds, Manufacturer: Zambuph