WELL-EQUIPPED BITS SIZE - 20 piece hex driver/ Hex drill precise bits in the following size: 10 PC SAE of 5/64inch, 3/32inch, 7/64inch, 1/8inch, 9/64inch, 5/32inch, 3/16inch, 7/32inch, 1/4inch, 5/16inch and 10 PC Metric of 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm INDUSTRIAL GRADE QUALITY - The hex drill bits are made from S2 steel material in a matt rust- finish with labeled size marks & magnetic tips. Two portable rubble strips store in a plastic case: one packs bits in SAE, another packs bits in Metric EXPERIMENT TESTS - The bits have experienced torsion and hardness test. The results of tests show that the maximum torsion force of bits are 180-200N and the hardness of bits are 57-59HRC. The high torsion and proper hardness avoid the bits break and wear USAGE VERSATILITY - 1/4 inch quick release hex shank driver bits fit for electric screwdriver, hand screwdriver, electric drills & air drills. Perfect for working on vehicles, bicycles & furniture. Assembling/repairing your furniture in an colour: silver Material: alloy steel Package Contents: 20 x hex driver Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.