Magnetic HeadThese screwdriver bits are magnetic head, so they can fix on the screw firmly. Strong magnetic, can suck the screws easily when used. High-quality materials Adopted high-quality S2 steel, shockproof and shockproof, wear-resistant. magnetic safety head 150mm screwdriver bar lot head surface for interior steel material coloroutside are the same. Good material does not need to do the surface decoration by the outside decoration, the batch quality is to look at the intrinsic Material. Hexagonal ShaftWith 1/4 in hexagonal shaft, Thanks to the wonderful workmanship, the bits not only surface sandblasting but also achieve high precision. 6 sizes selectableThere are 6 different sizes/set, professional multi size, hex handle on 1/4 edge, 150mm long .Use different screw sizes, will damage screwdriver and screw! Using the correct screwdriver