Double-ended screwdriver bit: one Phillips head, one flat head

The double-ended screwdriver bit with one flat head and one Phillips head is produced in various lengths and diameters, and is typically labeled as PHxSL. PH refers to the Phillips head part of the screwdriver bit, which is produced in various sizes such as PH0, PH1, and so on. The SL part refers to the flat head (slotted) side of the screwdriver bit, and it is produced in sizes such as SL7 and SL8. Typically, double-ended screwdriver bits (flat head and Phillips head) are made from S2 steel, which is an alloy containing vanadium, chromium, and molybdenum. This composition enhances the tip’s resistance to corrosion, rust, heat, and wear.