Rona 30 piece hss mini drill set 0 5 2 3mm rona 813205 p this 30 piece mini drill set from rona includes a range of metal twist drills varying in size from 0 5mm to 2 3mm the 2 35mm diameter shank gives optimum power transfer from chuck to drill bit p rona 813205 hss mini drill set 0 5 2 3mm 30 piece