Screwdriver Tool Set 25-in-1The 25 in 1 Precision Torx Screwdriver Tools Set is a set of a 25 piece toolkit that one can carry anywhere because it is only 7. 8 x 4. 0 inches. It contains 24 batch heads that are all made from high grade chrome vanadium steel with a hardness of about HRC52 60. The handle itself is derived from a high quality aviation alloy material for the support of the heads. Fix, assemble and disassemble devices with small screws such as smartphones, cameras,