[LuvDaBlues]

Chris,

Craig is correct, but I'm willing to bet it's a post tension slab. VERY popular here in north Texas. I can't stand them.

Just go to Home Depot and buy a 1/2" hammer drill, a couple of concrete drill bits, and the correct number of anchors. Commercial contractors around here prefer the chemical bolts (epoxy anchors) due to their tinsel strength. But I did the same as Craig, 1/2" expansion bolts. The slab is suppose to be 5" thick in a garage. Be sure not to penetrate all the way through. Just drill the depth of the anchor. There is a moisture membrane below the slab. If you puncture that, you'll have the possibility of water seeping through the hole during the wet season. Welcome to north Texas soils condition.