Zentra-ZOBO Central Drilling Systems
Centralized drilling system with unique detachable centers.
Zobo is a most complete drilling system. It has no equal. With centers: guide-pins, centering-points, pilot drill bits. And extensions.
Lead in from one side, finish from the other. No burrs or tear-out whatsoever.
Precise counter-sinking and enlarging of existing holes.
Use freehand or in stationary, factory applications, furniture or timber processing.
For every conceivable professional use and application: cabinet making, timber 
work, musical instruments, organ pipe making, composite stone (kitchen counter), laminates, stair making and more.
Available in Imperial and metric dimensions:
- Imperial:
- System 2 from ½" to 2½"
- System 3 from 1½" to 3¾"
- Metric: from 15-130 mm (5")
- Up to 200 mm (7-7/8") by special order.
- Optional: Deep drilling system, up to 10 feet in a straight line or on angle.
Save money in the long run.
ZOBO bits can be resharpened up to 30 times.
Swiss quality in materials and fabrication of bits.
Hardened and precision milled and polished for long life and lasting cutting power.
Chromium-plated for long service life.
Hardened and machined drill bit shanks.
Chrome-plated surface.
Drill deeper
Shank extensions available up to 15¾" (400 mm). Bits have internal thread so they attach very firmly and precisely to extensions.
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Long service life. Zobo bits are made of premium quality material. High-alloy premium steel is processed then precisely machined, hardened and sharpened, thus ensuring quality cutting output and a long lifetime performance. Surfaces are chromium plated to reduce friction and heat buildup, and minimize burn marks in material. |
Surface quality - just as if it had been planed Thanks to the precise tapered pre-cutters and the main cutting edges of the bit, the surface finish of the drilled material is very smooth and without burrs. |
Drill holes for every desired diameter. From Imperial sizes 1/2" to 4", incremented by 1/16", or metric sizes 10 mm to 130 mm, every millimetre is available as standard. Special sizes up to an accuracy of 1/100 mm and diameters of 131-200 mm can be delivered upon request. |
HOW TO CHOOSE: Chromium Steel Bits or Tungsten Carbide Bits?
Compared to common bits for drilling in plastic materials or to Forstner-type bits, ZOBO chromium steel bits are made of high-quality hardened chromium steel. The cutting edges are razor sharp. The bits cut very finely and enable a quality surface finish. The bits with tungsten carbide cutting tips are meant for use in drilling slab type material such as chipboards or plywood.
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| Softwood Chromium |
Hardwood Chromium or Carbide |
Aluminum Chromium |
Acrylic Glass Chromium |
Alucubond® Chromium |
Chipboard Carbide |
Plywood Carbide |
Corian Carbide |
HOW TO CHOOSE: ZOBO SYSTEM 2 or SYSTEM 3?
System 2Available in Imperial sizes from 1/2" to 2-1/2" (and metric: 10 mm - 65 mm).
Bit and shank are in one piece. Shank sizes 9 mm, 12 mm and 16/12 mm, depending on bit size. Centering point included with sale of bit. Other centering devices available. |
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System 3Available in sizes from 1-1/2" to 3-3/4", (metric: 15 mm to 130 mm), up to 200 mm by special order.
Bit and shank are screwed together (removable, but always delivered together). Shank sizes go from 9 mm, 12 mm, 20/13 mm to 30/16 mm. No centering point included with sale of bit; be sure to select the point, bit, or guide pin you need. |
Centering points and bits have tapered shaft end for friction fit : 2.5 mm diameter for 1/2 to 2" (10-50 mm), and 3.5 mm, over 2" (51-65 mm) sizes. 
Centering points and bits use normal parallel shaft ends and set screws to fasten.
