What are these

[Broccoli1]

Are these old Redhead holders?

Powder actuated tools?

Anyone have an idea of age?

[Broccoli1]

Bueller?

[Louie1961]

I am going to guess part of a toggle fastener of some kind.

[cloudman]

elecric fence doo hikies

[Denis G]

They were used on old electric hammers (percussive only - no rotation) using A-taper and B-taper chisels. To drill holes in concrete you used star bits and you had to rotate the bit by hand while the electric hammer pounded away.

[mrmikey]

As he said https://tinyurl.com/y94vrsgc and they were a pia if you didn't turn them enough and they got locked in the hole when you were drilling. You had to be careful not to to drill too close to the edge or you'd bust out a good sized chunk. They held tho, better than a lot of fasteners of the day ...........Mike

[BD1]

That red device holds what was called a self drilling anchor for a specific threaded rod size. The end of anchor has teeth on it and as the hammer was driving to would rotate the handle making the hole . Once hole was drilled the anchor was removed from hole and a red wedge insert was stuck in the tip of the anchor. You then placed anchor still inside the holder with the wedge into the drilled hole and activate gun. The pounding would then '' SET '' the anchor into the concrete . Upon completion the end of shell in the gun was snapped off leaving the anchor flush with concrete. The ORIGINAL was called '' REDHEAD ''. I found this on ebay. The RED wedge actually goes INTO the end with the teeth after drilling.
I think that gun was a black and decker 5015.

[Broccoli1]

Thank you fellas.

[Oldendum]

Here ya go ...

[Broccoli1]

age of the Electric drills used?

[WNY_TomB]

That red device holds what was called a self drilling anchor for a specific threaded rod size. The end of anchor has teeth on it and as the hammer was driving to would rotate the handle making the hole . Once hole was drilled the anchor was removed from hole and a red wedge insert was stuck in the tip of the anchor. You then placed anchor still inside the holder with the wedge into the drilled hole and activate gun. The pounding would then '' SET '' the anchor into the concrete . Upon completion the end of shell in the gun was snapped off leaving the anchor flush with concrete. The ORIGINAL was called '' REDHEAD ''. I found this on ebay. The RED wedge actually goes INTO the end with the teeth after drilling.
I think that gun was a black and decker 5015.

.
.
ive use air hammer drill that used those. drilling into ceiling was hard work as you had to push up fairly hard all the time. since hilti drills became popular and they sell air and electric versions i stopped using the old fashioned concrete anchors. hilti drills only require a light pressure when drilling

[Oldendum]

The Red Head self-drilling anchor was invented in 1910.

[Insaneride]

.
.
ive use air hammer drill that used those. drilling into ceiling was hard work as you had to push up fairly hard all the time. since hilti drills became popular and they sell air and electric versions i stopped using the old fashioned concrete anchors. hilti drills only require a light pressure when drilling

Hilti guns are even faster. The ones I've installed get tested to hold 180 lbs.

[downhand]

Got boxes of those and lead style anchors here. Star drills, yeeech that there is rougher work than rastlin a single speed 1/4hp 1/2" electric drill. Hilti still good imo

Ramsets are the most fun though

[gmt]

Are these old Redhead holders?

Powder actuated tools?

Anyone have an idea of age?

Looks like someone solved your problem, but I wanted to let you know that each month my company does a contest on its Facebook page called "Guess What it is." We give away a prize to the winner. I also tell people if they ever run across something they don't know what it is, post it on our Facebook page and ask. We have thousands of manufacturers, engineers, machinists, welders, makers who are followers. They love to go at that kind of stuff.