Strictly Ceilings 1/4" x 4" Acoustical Eye Lag Screw is designed to be installed into a wood ceiling joist or wood substrate. Once installed in the proper location, you can hang your ceiling wire from the wood lag fastener. The 4" wood eye lag screw gives added reach for projects where you may be installing the fastener through drywall or plaster. You can install the wood lag by using a lag adapter attached to your drill or a Lag Master Pole Tool for easy and safe installation from the ground.