I bought 8 for $12.00. I tried one out on a door latch or striker and it seemed to work OK. That's the limit of my experience with them. YMMV.
The set has 4 sizes in 2 lengths. A standard length and about a 3" length. I picked these up at SAS tool when they were at Mid-Ohio race track 7/27. I told the guy I knew alot of people that would want them (you guys & gals). There website is
www.SASTOOL.com I also picked up 4 clutch head bits for a drill-driver, $1.00 each.
Have fun and report back what you buy from them and how it works. They also had roloc's at 30 for $20.00