A:Answerrun to any hardware store and ask them for a scre depth gauge its a metal rod with measures on it that way you can gind the depth of screw you need then go back to hardware store wiht one fo the screws they included and tel them hat you need, but they should have sent you a plastick shim to make the screw shorter, its like a plastic tube that you put the screw threw so it only threads to a certian depth
A:AnswerThe mortar lines will have no problem holding that small weight. You can use TAPCON screws or concrete anchors. Typical drywall anchors should work as long as you use the correct ones. If you have a 50 lb TV each anchor needs to hold at least 1/4 of that weight. Bigger is better. Drill a hole barely large enough to push the anchor into. Once you tighten the screws into it you should find that the anchor is all but impossible to pull out. Still don't feel comfortable? Put a little epoxy in the brick/mortar hole before you push the anchor into it.
