Which bit size is common in precision screwdriver sets?

For precision screwdriver sets, 4 mm hex-shank bits are one of the most common sizes because they are compact enough for electronics repair while still providing good strength and compatibility with precision handles.

Common precision bit sizes include:

4 mm hex shank: widely used for phones, laptops, cameras, watches, game consoles, and other electronics

28–45 mm bit length: common for standard precision bits

Long 4 mm bits: useful for recessed screws and narrow housings

6.35 mm / 1/4-inch bits: more common in general-purpose, ratchet, and higher-torque screwdriver sets

For electronics repair, 4 mm bits are usually the better choice because the smaller shaft allows better access to compact devices and works well with slim precision screwdriver handles.

The actual tip profiles should include the sizes required for the target devices, such as Phillips, Torx, Security Torx, Pentalobe, Tri-point, Hex, and Slotted.

ToolQeen precision screwdriver sets commonly use H4 / 4 mm bits in different lengths, and OEM buyers can customize the bit length, profile, material, hardness, and set configuration according to the target application.