Chilean jack mackerels are commonly 45 cm (18 in) long, though they can grow to 70 cm (28 in). They have elongated and laterally compressed bodies. The head is large with well-developed transparent protective membranes (the adipose eyelid) covering the eyes. The mouth is also large, with the rear edge of the lower jaw aligning with the front edge of the eyes. It possesses small teeth. Each of the has a distinct notch on its rear edge. The second [pdf]
For jackhammer bits for concrete or rock, use point or chisel bits. For asphalt or softer materials, spade and asphalt cutter bits are often more efficient. Always verify that the bit’s shank style matches your jack hammer, demo hammer, or hydraulic breaker specifications. [pdf]
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