Old plugs none of my two laptops worked on extension

Works well to extend and/or convert plug types for low power stuff. Got it as a Deal of the Day for a great price. You CAN... + Get a longer length by using two sets with any matching plug and jack at the middle. + Change one plug size to another by using a plug and non-matching jack. + Get two weak thin circular magnets (inside the box) and two matching flat metal pieces (inside the flap) that can be useful for crafts. * Fit an Adaptaplug plug in the plug end, but you may not get a reliable connection as the Adaptaplug pins are smaller than the fat pin used on these plugs. You CANNOT... - Accidentally (or intentionally) change the polarity of the connection - the jacks and plugs have one fat pin and one skinny pin, so they only fit one way. - Make a Plug-Plug or Jack-Jack cable - to change a connection from a plug to a jack or jack to plug. Plugs only fit on the black end, jacks only fit on the gray end. The pin spacing is different on the jacks vs the plugs. - Use the jacks and plugs on Adaptaplug sockets (AC/DC adapters or extension cables) - the fat pin is too fat to fit.

It's good item and you get different sizes. But this style is not meant to work with everything. Even it fits but still not able to go all the way in.

this dc cabe kit is quite the prize, its versitalle, all you have to do is plug in any size cable your working with, and theres so any different sizes if rou just use it one time its paid for itself, l highly recommend it,

It seems like a lot of the complaints on this item are because people are expecting too much. A lot of products use non-standard barrel sizes. I wouldn't expect a simple extension kit to have every barrel option. This has the most popular sizes, works as it should, and makes it pretty foolproof. I wish it was less foolproof so I could easily convert to tip negative for the few oddballs I have and just use a standard charger. But it is an extension, not a converter. At the closeout price it is a good, cheap option; especially in a post-RadioShack world.