Here's the skinny. I bought new NHT speakers, model SB3. They ae going to be wall mounted. I contacted NHT and they told me I needed a particular mount. I searched the web and got a good price for the mounts. But no screws to attach the mounts to the speakers. Back on the phone with NHT. They tell me I need "standard quarter twenty screws", preferrably steel as the sleaves are steel. I asked for a length, they repeated "standard quarter twenty." Fine with me. OK, off to my local Home Depot I go. Turns out that a 1/4" (diameter) - 20 (twenty threads per inch) screw(or bolt) comes in MANY lengths: ranging let's say from 1/2" to 4". So, me being the screw genius that I am, figure that if there are 20 threads to one inch, they probably meant a one inch long screw. So that's what I bought, a bag of 1" long 1/4"-20's. Well, I get home and try them out only to find that they are TOO LONG. The hole is not deep enough for these 1" long screws. At this point I feel like a total idiot. Some one please help. WHAT IS A "STANDARD" QUARTER TWENTY ??? Thanks. Rich B.