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Twister Brad and Spur Drill 3.90mm silver metal bit

M.A. Ford

M.A. Ford 20715350 Twister Brad & Spur Drill 3.90mm

SKU CH-GT92-MDR3S

A Twister brad and spur drill bit creates clean, flat-bottom holes in wood at 3.90 mm diameter

  • Precision 3.90 mm hole size for accurate joinery
  • Brad-and-spur tip design reduces wandering on entry
  • M.A. Ford manufacturing quality for consistent performance
  • Twister flute geometry clears chips efficiently
  • New condition ensures full tool life from first use

What the drill does

The M.A. Ford Twister Brad & Spur Drill 3.90mm is a power-tool accessory designed for clean entry holes in wood and similar materials. Its brad point centres the bit without wandering and the spurs shear fibres for a smooth bore. Woodworkers and joiners who need precise 3.90 mm holes will find it suited to the task.

Capacity and headroom

The drill cuts a single 3.90 mm diameter hole per pass and is limited to that size. It handles shallow to medium depths in softwoods and hardwoods but runs out of clearance in very thick stock or when a larger diameter is required. Users needing different hole sizes must select another bit.

Thermals noise and power draw

Friction generates heat during prolonged drilling; withdrawing the bit regularly clears chips and reduces temperature rise. Noise level depends on the drill motor and workpiece density rather than the bit itself. Power draw is determined by the driving tool and the material being cut.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $34.99
Pricier than about 57% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameM.A. FORD

Questions about this item

Will the 3.90 mm Twister Brad & Spur Drill fit the chuck on my older cordless drill?

The 3.90 mm shank fits any standard drill chuck that accepts bits of that diameter; check your chuck's minimum and maximum capacity to confirm.

How can I verify the 20715350 drill is cutting cleanly after I install it?

Run the drill at the recommended speed for your material; a clean entry hole with minimal tear-out and steady chip ejection shows it is working as intended.

Does the box include only the 3.90 mm Twister Brad & Spur Drill or are there extra accessories?

The package contains the single 3.90 mm Twister Brad & Spur Drill; no additional bits, pilot drills or lubricants are supplied.

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