Hex Drill Bit - TOOGOO(R) Magnetic Nut Driver Set 8mm 5/16" Socket Adapter Hex Drill Bit 9 Pcs Product Name : Magnetic Nut Driver Set Material : Chrome Vanadium Steel Hex Size : Socket: 8mm / 5/16"; Shank: 6mm / 1/4" Overall Size : 40 x 12mm / 1.6" x 0.47" (L*Max. D)