Feature: *The special cross screwdriver bit for electricians is made of alloy steel with hardness up to HRC63 . *Phosphating black treatment, more rust proof, more tight screw engagement. *With magnetism, you can work more easily. *Color differentiation, easy to work. *Specification: FPH1,(4.5mm), FPH2,(5.5mm), FPH3,(7mm), Length: 150mm/5.9& x27;& x27;. Specifications: Product Name: Special Cross Screwdriver Bit Material: Alloy steel Color: Black, Red, Yellow, Green (As shown) Magnetic: Yes Size: FPH1, FPH2, FPH3 Head Size: 4.5mm(FPH1), 5.5mm(FPH2), 7mm(FPH3) Optional Length: (Approx. ) 150mm / 5.9& x27;& x27; Suitable for: Socket switch, Circuit breakers, air switches, socket panels, earth leakage protectors, breakers *Please note that the colored holster is insulated while the rest is not. Quantity: 4pcs/set Package Included: 3 Screwdriver Bits 1 Magnetic Ring Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.