Strangely enough, your photo of the handle may have solved a mystery for me: who made the Sears "Companion" power drill I have? It is too early, apparently, to carry the typical three-digit Sears prefix number identifying their manufacturer, but it has a hacksaw-like handle of the same shape, and with the same checkering pattern, as yours. The handle, however, is black instead of red, and has a very shallow oval depression between the rivets, as though there was an intent to add a label or decal in the area.