When a pad tears off during CPU or IC removal, you need a drill tip fine enough to open the via underneath without chewing into the neighbouring traces, and the Qianli 0.15mm Drill Bit Heads 2.35mm (5 pcs) give your repair bench exactly that reach. Each head carries a 0.15mm working tip on a standard 2.35mm shank, so it locks straight into the grinding and polishing pens most Pakistani technicians already keep beside the microscope. You get five heads in one pack, which matters because a tip this thin wears and snaps faster than any cutting disc or burr in your kit. The real job here is board-level precision. On a hardware fault case where a charging issue, network issue, or no-power fault traces back to a missing pad, you open the via with this head, expose the copper, and run a clean jumper to the nearest test point. The same tip helps you dig into a solder pad hole when old solder, underfill, or residue blocks the connection after an IC change, so the fresh joint bonds to copper instead of sitting on dirt. A 0.15mm point also lets you mark a precise start position before you move up to a bigger burr, which stops the larger head from wandering across the board. Fit comes first with any pen accessory, and the 2.35mm shank keeps this simple. The heads suit electric grinding pens built around a 2.35mm chuck, including the Qianli DM360 Mini, Qianli SG-02, 2UUL DA81, MaAnt D1, Mechanic IRX6, Kaisi 328, Relife RL-068 series, Mijing DM-1, and XZZ-Z1. Pens with an auto-align push-in chuck hold the head concentric, so you can swap from a cutting or polishing head to this drill without re-centring. That concentricity is not a luxury at 0.15mm, since even slight wobble widens the hole and can lift the next pad. Handling technique decides how long each head lasts. Set your pen to a low power level for the first contact, let the tip find its spot under the microscope, and only then raise the speed slightly. Keep the pen perpendicular to the board, feed with almost no pressure, and lift out frequently to clear debris. Side load breaks a micro drill far more often than speed does, so never use the tip to scrape sideways or lever material out. Clamp the motherboard firmly in a PCB holder so the board cannot shift mid-cut, and clean flux and dust off the area first so you can see exactly where the copper sits. After drilling, check continuity with your multimeter before you lay the jumper, then finish the joint with your soldering station at a controlled temperature. This head sits in the PCB repair and rework stage of your workflow, right after IC removal with a hot air station and before jumper soldering and final testing. It pairs naturally with a stereo microscope, a PCB holder, fine jumper wire, UV solder mask, and a reliable multimeter. If you handle pad recovery daily, the Qianli iHandy DM460-K cordless polishing pen with its quick-mount chuck makes a sensible upgrade on the handpiece side. For a shop that opens motherboards every day, a dead phone with a ripped pad stops being a board you return to the customer unrepaired. With five heads in the pack, you keep a sharp spare ready for the next job instead of forcing a dull tip through a delicate board, and that alone saves boards from the scrap box. Store the heads in their case between jobs, because a tip this fine bends quickly if it rolls loose in a drawer with heavier tools.
