12pcs 1/4 Inch 50mm*T5-T40 Magnetic Torx Screwdriver Bits Set With S2 high quality steel, group head surface of steel material color, from the inside to the outside are the same number of headband. Strong magnetic, S2 alloy steel hard,?good workmanship, high precision. In the installation can easily suck screws, electric screwdriver, manual screwdriver, electric drill, group general tools. Handle size: 6.3 mm or 1/4"