QSAC2100 fits the QSWI1000 & QSWI2000 to attach to wood beam joists. The QSAC2100 are made of steel & are 12” long & 2” wide. Machine crafted to fit standard building joists, trusses, or Florida style construction. Each of our wood beam adapters are able to hold up to 200 lbs. Includes top screw hole for security and safety. They have a 1.5” bend that simply clips over the wood joist. All the necessary hardware is provided.