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Based on a suggestion from cabinetmaker Stephen Shepherd for a jig that could drill chair spindles, this centering jig has a large bearing surface with sighting marks that make visual alignment easy. It can be used when end-drilling round stock 5/16" to 1 1/2" in diameter.

It also permits drilling of spheres and has a V-notch for drilling into the side of a cylinder or the edge of dimensioned stock. As a side benefit, the conical shape helps catch dust when drilling overhead. The jig stands 2" (50mm) tall, including the height of a bushing.

Made from durable polycarbonate, it comes with hardened steel bushings in Imperial sizes (1/8", 3/16" and 1/4") or metric sizes (3mm, 5mm and 6mm). Bushings are also available separately should you wish to have both. We offer extra-long HSS drill bits in sets of three separately, in diameters matched to the bushing sizes listed above.

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