The factory’s products
The Kaiapoi factory makes 280 types of drill. They differ in their diameter, length, shank type, coating, and tip. The shank can be straight, reduced, or tapered.
There are three series of diameter: metric, imperial, and ‘number’. The metric diameters increase from 1mm to 3.5mm in 0.05mm increments, and from 4mm to 13mm in 0.5mm increments. Imperial drill bits increase in size by 1∕64 inch. Number drills have diameters from 68 (1.25mm) to 1 (5.76mm). The tip can have different angles and be chisel point or split point. Split-point drills are more expensive because they require an additional grinding operation to add another facet to the tip, reducing the size of the chisel point. They aren’t as durable in more stable drilling environments such as drill presses, but they can drill a hole without a punch-mark without wandering. This makes them popular for the DIY market and they are the most popular type of twist drill sold in the US.
An oil press under construction