For your consideration, here is a Vintage Grip-All Screw Cap Jar Opener.  It has some wear and spots on it.  It measures 7 7/8 inches long and 3 1/2 inches wide.  It will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (474.60s-.8kx1)