General Hardware › Hex Bit - 40.400 4mm x 50mm Image 1 of 1 Hex Bit - 40.400 4mm x 50mm $1.27 Hex bit suitable to drive all Zipbolt UT Mini's, can be used in a screwdriver, side ratchet or cordless drill. Add To Cart Added! Hex bit suitable to drive all Zipbolt UT Mini's, can be used in a screwdriver, side ratchet or cordless drill. You Might Also Like Deep Socket Tool 10mm – 40.540 $8.50 Railbolt Drill Guide - Kit 40.260 $25.40 Hex Bit - 40.410 5mm x 50mm $1.27 Universal Drill Guide Kit - 40.280 $44.75 40.520 Deep Socket Tool 7mm $5.22