Descriptions<br> Those Square Head Screwdriver Bits are made of S2 alloy steel which is a commonly used material in hardware.<br> Magnetic bits are firmly fixed on screwdrivers.<br> 3 sizes a set at an affordable price can meet your requirements.    Specifications  Brand: JAPAN SEALS   Materials: S2 alloy steel  Type of shank: 6.35mm \/ 0.25 inch hex   Net weight: (approx.) 35g   Dimensions:<br>                No.         Size of head (mm)         Lgth.(mm)               S1         2.4*2.4         50 \/ 2 in.               S2         3.0*3.0         50 \/ 2 in.               S3         3.4*3.4         50 \/ 2 in.             <br>  Features<br> Those bits are magnetic that can be firmly fixed on screwdrivers， fitting for electric screwdrivers， hand screwdrivers， electric drills， air drills and so forth.<br>  NotesPlease allow a bit manual measuring errors.<br>Package included1 x 2.4*2.4mm S1 Square Head Screwdriver Bit1 x 3.0*3.0mm S2 Square Head Screwdriver Bit1 x 3.4*3.4mm S3 Square Head Screwdriver Bit<br><br>S1:<br>S2:<br>S3: