Star Hamrtwist?

[NoahG]

Sorting through a toolbox full of drill bits I put together a decent collection of these. Apparently it’s a masonry drill system with removable/replaceable bits. Anybody into these? Any worth?

 

[RTM]

They look like my Rawl plug drill bits. No idea where they are right now.

 

[hkd76]

We used those when I worked at NWB in Omaha in the early 70s. Punched many a small hole for an anchor to hang a telephone on a wooden backboard on a block or cement wall. Hammer drills were pretty hard to come by back then for an ordinary install or a repair job. By the way if you use it make sure you turn it every couple of hammer blows or it gets stuck in that position and then you've got a mess

 

[NoahG]

We used those when I worked at NWB in Omaha in the early 70s. Punched many a small hole for an anchor to hang a telephone on a wooden backboard on a block or cement wall. Hammer drills were pretty hard to come by back then for an ordinary install or a repair job. By the way if you use it make sure you turn it every couple of hammer blows or it gets stuck in that position and then you've got a mess

These belong the my wife’s grandpa, who retired in the 90’s after a long career with ADT. I myself have my grandfathers star chisels he used to hang mirrors while working at a glass company in the early 50’s.

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[kd3pc]

I spent a couple of years banging one of these as an apprentice electrician - putting threaded pipe back in the wall and installing hangars for conduit.

 

[xela456]

They are used by rock climbers to put anchors in for new routes when climbing. Search rock climbing anchor drill.
To me I'd rather carry a full size battery drill up a wall than bang on one of these for 5 minutes at a time!