This expansive wood boring drill bit set is ideal tool for use on all types of wood. Drill holes from : 22mm to 76mm in diameter. Drill set supplied with two bits: 22mm - 45mm and 45mm - 76mm. Easy to adjust and change bits, simply use a 4mm Allen key. Fully heat treated high carbon steel. Hex shank to help avoid bit slipping in chuck. Brand new item in retail packaging. Please note supplied 'T' bar wrench is a legacy part. Requires a 4mm Allen key for adjustment. Included: Expansive bit 2 x blades cutters 22mm - 45mm and 45mm - 76mm 'T' bar wrench