Small hand drill used to make holes in the front weights of squid jigs. In the case of one hole, a wire can be put through it and around the head of the jig to add extra weight. To reduce the weight, extra holes can be drilled. Rubber is placed under the jig to make it easier to drill. Naturally a power drill would be faster, but often not an option when out fishing.
10 cm long.

From Daiichi Seiko