Double Holes Aluminum Files | Flat Flexible Curved Tooth Files

Chinese professional manufacturer of needle files.

Double Holes Aluminum Files' Features

Needle Files are specially designed for jewelers, watchmakers, diemakers, etc. The appropriate cut number is marked on the round handle.

Item No.

Set

Hand

Half Round

Three Square

Square

Round

Flat

Knife

Barrette

Crossing

Ovral

Joint Round

Feater Edge

CS1512106

6 Pcs

CS1512106

7 Pcs

CS1512106

8 Pcs

CS1512106

10 Pcs

CS1512106

12 Pcs

What is Needle Files?

A needle file is a compact, fine-toothed hand file designed for precision work. Most are about 140 mm (5.5 in) long, slim, and pointed so they can reach tight spots and refine small features. They remove small amounts of material with control, which makes them a go-to tool for detailed shaping, smoothing sharp edges, and fine fitting on metal, wood, plastics, and even ceramics when diamond coated.

How needle files are used in DIY and home projects?

Needle files shine anywhere you need careful, small-scale material removal rather than aggressive stock removal. Common uses include:

Deburring cut metal edges on brackets, hinges, and sheet goods

Easing tight hardware fit, such as strike plates, latch pockets, and hinge mortises

Cleaning and adjusting threads on screws or inside small tapped holes

Refining cutouts in electrical box plates or faceplates

Truing and smoothing 3D-printed parts and model components

Shaping tiny wood details on trim, inlays, and small joinery

Smoothing chip-prone edges on glass tiles or ceramics with diamond needle files

Because they work slowly and predictably, needle files help prevent over-cutting. That control is especially useful on visible edges or parts that must fit together cleanly.

Needle Files' types and shapes

Needle files come in two main abrasive styles and a range of shapes.

Steel-toothed needle files

Cut types: single cut (parallel teeth for a smoother finish) and double cut (crisscross teeth for faster removal).

Pattern: Swiss pattern usually means finer, more precise teeth and graded cuts (often numbered). American pattern indicates coarser cuts.

Diamond-coated needle files

Abrasive grit bonded to a steel blank. Effective on hardened steel, carbide, glass, ceramics, and some stones where traditional files skate.

Often used with a light lubricant like water to keep them cutting cleanly.

Common needle file shapes:

Flat: straight faces for general smoothing and fitting

Half-round: flat on one side, curved on the other for inside curves and flats

Round: for enlarging holes and refining radii

Triangle (three-square): for corners, grooves, and inside angles

Square: for notches, slots, and keyways

Knife: thin wedge for tight slots and scribed lines

Barrette: one-sided teeth with a safe back for filing up to a surface without nicking it

Crossing: double-curved faces for complex contours

Many sets include 6 to 12 shapes. A starter set with flat, half-round, round, triangle, and square covers most household needs.

How to use a needle file?

A few good habits make a big difference in results and tool life.

Step 1: Secure the workpiece

Use a vise, clamps, or a bench hook so both hands work on the file, not holding the part.

Step 2: Mark the goal

Scribe a line or use a marker to show where material needs to come off. Stop at the line, do not cross it.

Step 3: File on the cutting stroke

Most files cut on the push stroke. Apply light, steady pressure pushing forward, then lift or ease pressure on the return stroke to avoid dulling the teeth.

Step 4: Use the right part of the file

Engage only a short section for better feel. Switch areas of the file to spread wear.

Step 5: Keep it clean

For steel-toothed files, rub chalk into the teeth before filing soft metals to reduce pinning. Clean with a file card or a brass brush. Knock out stubborn pins with a thin piece of copper.
For diamond files, use water as a lubricant and rinse occasionally to clear swarf.

Step 6: Work through grits or cuts

Start with a coarser file to shape, then move to a finer one for the finish. Finish with abrasive paper if a smoother surface is needed.

Step 7: Protect nearby surfaces

Choose a file with a safe edge (no teeth) or tape adjacent surfaces so accidental contact does not mar the work.